diff --git a/Pipfile.lock b/Pipfile.lock
index db53ca2..f6679e5 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -13,20 +13,12 @@
         ]
     },
     "default": {
-        "appnope": {
-            "hashes": [
-                "sha256:5b26757dc6f79a3b7dc9fab95359328d5747fcb2409d331ea66d0272b90ab2a0",
-                "sha256:8b995ffe925347a2138d7ac0fe77155e4311a0ea6d6da4f5128fe4b3cbe5ed71"
-            ],
-            "markers": "sys_platform == 'darwin'",
-            "version": "==0.1.0"
-        },
         "attrs": {
             "hashes": [
-                "sha256:69c0dbf2ed392de1cb5ec704444b08a5ef81680a61cb899dc08127123af36a79",
-                "sha256:f0b870f674851ecbfbbbd364d6b5cbdff9dcedbc7f3f5e18a6891057f21fe399"
+                "sha256:08a96c641c3a74e44eb59afb61a24f2cb9f4d7188748e76ba4bb5edfa3cb7d1c",
+                "sha256:f7b7ce16570fe9965acd6d30101a28f62fb4a7f9e926b3bbc9b61f8b04247e72"
             ],
-            "version": "==19.1.0"
+            "version": "==19.3.0"
         },
         "backcall": {
             "hashes": [
@@ -37,11 +29,11 @@
         },
         "beautifulsoup4": {
             "hashes": [
-                "sha256:034740f6cb549b4e932ae1ab975581e6103ac8f942200a0e9759065984391858",
-                "sha256:945065979fb8529dd2f37dbb58f00b661bdbcbebf954f93b32fdf5263ef35348",
-                "sha256:ba6d5c59906a85ac23dadfe5c88deaf3e179ef565f4898671253e50a78680718"
+                "sha256:5279c36b4b2ec2cb4298d723791467e3000e5384a43ea0cdf5d45207c7e97169",
+                "sha256:6135db2ba678168c07950f9a16c4031822c6f4aec75a65e0a97bc5ca09789931",
+                "sha256:dcdef580e18a76d54002088602eba453eec38ebbcafafeaabd8cab12b6155d57"
             ],
-            "version": "==4.7.1"
+            "version": "==4.8.1"
         },
         "bleach": {
             "hashes": [
@@ -58,10 +50,10 @@
         },
         "certifi": {
             "hashes": [
-                "sha256:046832c04d4e752f37383b628bc601a7ea7211496b4638f6514d0e5b9acc4939",
-                "sha256:945e3ba63a0b9f577b1395204e13c3a231f9bc0223888be653286534e5873695"
+                "sha256:e4f3620cfea4f83eedc95b24abd9cd56f3c4b146dd0177e83a21b4eb49e21e50",
+                "sha256:fd7c7c74727ddcf00e9acd26bba8da604ffec95bf1c2144e67aff7a8b50e6cef"
             ],
-            "version": "==2019.6.16"
+            "version": "==2019.9.11"
         },
         "chardet": {
             "hashes": [
@@ -72,10 +64,10 @@
         },
         "decorator": {
             "hashes": [
-                "sha256:86156361c50488b84a3f148056ea716ca587df2f0de1d34750d35c21312725de",
-                "sha256:f069f3a01830ca754ba5258fde2278454a0b5b79e0d7f5c13b3b97e57d4acff6"
+                "sha256:54c38050039232e1db4ad7375cfce6748d7b41c29e95a081c8a6d2c30364a2ce",
+                "sha256:5d19b92a3c8f7f101c8dd86afd86b0f061a8ce4540ab8cd401fa2542756bce6d"
             ],
-            "version": "==4.4.0"
+            "version": "==4.4.1"
         },
         "defusedxml": {
             "hashes": [
@@ -98,20 +90,27 @@
             ],
             "version": "==2.8"
         },
+        "importlib-metadata": {
+            "hashes": [
+                "sha256:aa18d7378b00b40847790e7c27e11673d7fed219354109d0e7b9e5b25dc3ad26",
+                "sha256:d5f18a79777f3aa179c145737780282e27b508fc8fd688cb17c7a813e8bd39af"
+            ],
+            "version": "==0.23"
+        },
         "ipykernel": {
             "hashes": [
-                "sha256:346189536b88859937b5f4848a6fd85d1ad0729f01724a411de5cae9b618819c",
-                "sha256:f0e962052718068ad3b1d8bcc703794660858f58803c3798628817f492a8769c"
+                "sha256:1a7def9c986f1ee018c1138d16951932d4c9d4da01dad45f9d34e9899565a22f",
+                "sha256:b368ad13edb71fa2db367a01e755a925d7f75ed5e09fbd3f06c85e7a8ef108a8"
             ],
-            "version": "==5.1.1"
+            "version": "==5.1.3"
         },
         "ipython": {
             "hashes": [
-                "sha256:11067ab11d98b1e6c7f0993506f7a5f8a91af420f7e82be6575fcb7a6ca372a0",
-                "sha256:60bc55c2c1d287161191cc2469e73c116d9b634cff25fe214a43cba7cec94c79"
+                "sha256:dfd303b270b7b5232b3d08bd30ec6fd685d8a58cabd54055e3d69d8f029f7280",
+                "sha256:ed7ebe1cba899c1c3ccad6f7f1c2d2369464cc77dba8eebc65e2043e19cda995"
             ],
             "markers": "python_version >= '3.3'",
-            "version": "==7.6.1"
+            "version": "==7.9.0"
         },
         "ipython-genutils": {
             "hashes": [
@@ -122,31 +121,31 @@
         },
         "ipywidgets": {
             "hashes": [
-                "sha256:cb263c6974aca902d00a435711823bb4aaf6614a5f997f517e15fa84151e8fa2",
-                "sha256:eab6060f20f7f10d91f6efc8d33f9fd22133406980fcaee2738d836a910402f4"
+                "sha256:13ffeca438e0c0f91ae583dc22f50379b9d6b28390ac7be8b757140e9a771516",
+                "sha256:e945f6e02854a74994c596d9db83444a1850c01648f1574adf144fbbabe05c97"
             ],
-            "version": "==7.5.0"
+            "version": "==7.5.1"
         },
         "jedi": {
             "hashes": [
-                "sha256:53c850f1a7d3cfcd306cc513e2450a54bdf5cacd7604b74e42dd1f0758eaaf36",
-                "sha256:e07457174ef7cb2342ff94fa56484fe41cec7ef69b0059f01d3f812379cb6f7c"
+                "sha256:786b6c3d80e2f06fd77162a07fed81b8baa22dde5d62896a790a331d6ac21a27",
+                "sha256:ba859c74fa3c966a22f2aeebe1b74ee27e2a462f56d3f5f7ca4a59af61bfe42e"
             ],
-            "version": "==0.14.1"
+            "version": "==0.15.1"
         },
         "jinja2": {
             "hashes": [
-                "sha256:065c4f02ebe7f7cf559e49ee5a95fb800a9e4528727aec6f24402a5374c65013",
-                "sha256:14dd6caf1527abb21f08f86c784eac40853ba93edb79552aa1e4b8aef1b61c7b"
+                "sha256:74320bb91f31270f9551d46522e33af46a80c3d619f4a4bf42b3164d30b5911f",
+                "sha256:9fe95f19286cfefaa917656583d020be14e7859c6b0252588391e47db34527de"
             ],
-            "version": "==2.10.1"
+            "version": "==2.10.3"
         },
         "jsonschema": {
             "hashes": [
-                "sha256:0c0a81564f181de3212efa2d17de1910f8732fa1b71c42266d983cd74304e20d",
-                "sha256:a5f6559964a3851f59040d3b961de5e68e70971afb88ba519d27e6a039efff1a"
+                "sha256:2fa0684276b6333ff3c0b1b27081f4b2305f0a36cf702a23db50edb141893c3f",
+                "sha256:94c0a13b4a0616458b42529091624e66700a17f847453e52279e35509a5b7631"
             ],
-            "version": "==3.0.1"
+            "version": "==3.1.1"
         },
         "jupyter": {
             "hashes": [
@@ -158,10 +157,10 @@
         },
         "jupyter-client": {
             "hashes": [
-                "sha256:73a809a2964afa07adcc1521537fddb58c2ffbb7e84d53dc5901cf80480465b3",
-                "sha256:98e8af5edff5d24e4d31e73bc21043130ae9d955a91aa93fc0bc3b1d0f7b5880"
+                "sha256:60e6faec1031d63df57f1cc671ed673dced0ed420f4377ea33db37b1c188b910",
+                "sha256:d0c077c9aaa4432ad485e7733e4d91e48f87b4f4bab7d283d42bb24cbbba0a0f"
             ],
-            "version": "==5.3.1"
+            "version": "==5.3.4"
         },
         "jupyter-console": {
             "hashes": [
@@ -172,10 +171,10 @@
         },
         "jupyter-core": {
             "hashes": [
-                "sha256:2c6e7c1e9f2ac45b5c2ceea5730bc9008d92fe59d0725eac57b04c0edfba24f7",
-                "sha256:f4fa22d6cf25f34807c995f22d2923693575c70f02557bcbfbe59bd5ec8d8b84"
+                "sha256:464769f7387d7a62a2403d067f1ddc616655b7f77f5d810c0dd62cb54bfd0fb9",
+                "sha256:a183e0ec2e8f6adddf62b0a3fc6a2237e3e0056d381e536d3e7c7ecc3067e244"
             ],
-            "version": "==4.5.0"
+            "version": "==4.6.1"
         },
         "lxml": {
             "hashes": [
@@ -246,12 +245,19 @@
             ],
             "version": "==0.8.4"
         },
+        "more-itertools": {
+            "hashes": [
+                "sha256:409cd48d4db7052af495b09dec721011634af3753ae1ef92d2b32f73a745f832",
+                "sha256:92b8c4b06dac4f0611c0729b2f2ede52b2e1bac1ab48f089c7ddc12e26bb60c4"
+            ],
+            "version": "==7.2.0"
+        },
         "nbconvert": {
             "hashes": [
-                "sha256:138381baa41d83584459b5cfecfc38c800ccf1f37d9ddd0bd440783346a4c39c",
-                "sha256:4a978548d8383f6b2cfca4a3b0543afb77bc7cb5a96e8b424337ab58c12da9bc"
+                "sha256:21fb48e700b43e82ba0e3142421a659d7739b65568cc832a13976a77be16b523",
+                "sha256:f0d6ec03875f96df45aa13e21fd9b8450c42d7e1830418cccc008c0df725fcee"
             ],
-            "version": "==5.5.0"
+            "version": "==5.6.1"
         },
         "nbformat": {
             "hashes": [
@@ -262,16 +268,16 @@
         },
         "nltk": {
             "hashes": [
-                "sha256:764c20a5f8532a681c261af3c7d1a54768a35df6f3603df75e615cbd34e47cb5"
+                "sha256:bed45551259aa2101381bbdd5df37d44ca2669c5c3dad72439fa459b29137d94"
             ],
-            "version": "==3.4.4"
+            "version": "==3.4.5"
         },
         "notebook": {
             "hashes": [
-                "sha256:0be97e939cec73cde37fc4d2a606a6f497a9addf3afcf61a09a21b0c35e699c5",
-                "sha256:5c16dbf4fa824db19de43637ebfb24bcbd3b4f646e5d6a0414ed3a376d6bc951"
+                "sha256:660976fe4fe45c7aa55e04bf4bccb9f9566749ff637e9020af3422f9921f9a5d",
+                "sha256:b0a290f5cc7792d50a21bec62b3c221dd820bf00efa916ce9aeec4b5354bde20"
             ],
-            "version": "==6.0.0"
+            "version": "==6.0.1"
         },
         "pandocfilters": {
             "hashes": [
@@ -309,11 +315,11 @@
         },
         "prompt-toolkit": {
             "hashes": [
-                "sha256:11adf3389a996a6d45cc277580d0d53e8a5afd281d0c9ec71b28e6f121463780",
-                "sha256:2519ad1d8038fd5fc8e770362237ad0364d16a7650fb5724af6997ed5515e3c1",
-                "sha256:977c6583ae813a37dc1c2e1b715892461fcbdaa57f6fc62f33a528c4886c8f55"
+                "sha256:46642344ce457641f28fc9d1c9ca939b63dadf8df128b86f1b9860e59c73a5e4",
+                "sha256:e7f8af9e3d70f514373bf41aa51bc33af12a6db3f71461ea47fea985defb2c31",
+                "sha256:f15af68f66e664eaa559d4ac8a928111eebd5feda0c11738b5998045224829db"
             ],
-            "version": "==2.0.9"
+            "version": "==2.0.10"
         },
         "ptyprocess": {
             "hashes": [
@@ -332,9 +338,9 @@
         },
         "pyrsistent": {
             "hashes": [
-                "sha256:50cffebc87ca91b9d4be2dcc2e479272bcb466b5a0487b6c271f7ddea6917e14"
+                "sha256:eb6545dbeb1aa69ab1fb4809bfbf5a8705e44d92ef8fc7c2361682a47c46c778"
             ],
-            "version": "==0.15.3"
+            "version": "==0.15.5"
         },
         "python-dateutil": {
             "hashes": [
@@ -345,40 +351,40 @@
         },
         "pyzmq": {
             "hashes": [
-                "sha256:00dd015159eaeb1c0731ad49310e1f5d839c9a35a15e4f3267f5052233fad99b",
-                "sha256:03913b6beb8e7b417b9910b0ee1fd5d62e9626d218faefbe879d70714ceab1a2",
-                "sha256:13f17386df81d5e6efb9a4faea341d8de22cdc82e49a326dded26e33f42a3112",
-                "sha256:16c6281d96885db1e15f7047ddc1a8f48ff4ea35d31ca709f4d2eb39f246d356",
-                "sha256:17efab4a804e31f58361631256d660214204046f9e2b962738b171b9ad674ea7",
-                "sha256:2b79919ddeff3d3c96aa6087c21d294c8db1c01f6bfeee73324944683685f419",
-                "sha256:2f832e4711657bb8d16ea1feba860f676ec5f14fb9fe3b449b5953a60e89edae",
-                "sha256:31a11d37ac73107363b47e14c94547dbfc6a550029c3fe0530be443199026fc2",
-                "sha256:33a3e928e6c3138c675e1d6702dd11f6b7050177d7aab3fc322db6e1d2274490",
-                "sha256:34a38195a6d3a9646cbcdaf8eb245b4d935c7a57f7e1b3af467814bc1a92467e",
-                "sha256:42900054f1500acef6df7428edf806abbf641bf92eb9ceded24aa863397c3bae",
-                "sha256:4ccc7f3c63aa9d744dadb62c49eda2d0e7de55649b80c45d7c684d70161a69af",
-                "sha256:5b220c37c346e6575db8c88a940c1fc234f99ce8e0068c408919bb8896c4b6d2",
-                "sha256:6074848da5c8b44a1ca40adf75cf65aa92bc80f635e8249aa8f37a69b2b9b6f5",
-                "sha256:61a4155964bd4a14ef95bf46cb1651bcf8dcbbed8c0108e9c974c1fcbb57788f",
-                "sha256:62b5774688326600c52f587f7a033ca6b6284bef4c8b1b5fda32480897759eac",
-                "sha256:65a9ffa4f9f085d696f16fd7541f34b3c357d25fe99c90e3bce2ea59c3b5b4b6",
-                "sha256:76a077d2c30f8adc5e919a55985a784b96aeca69b53c1ea6fd5723d3ae2e6f53",
-                "sha256:8e5b4c51557071d6379d6dc1f54f35e9f6a137f5e84e102efb869c8d3c13c8ff",
-                "sha256:917f73e07cc04f0678a96d93e7bb8b1adcccdde9ccfe202e622814f4d1d1ecfd",
-                "sha256:91c75d3c4c357f9643e739db9e79ab9681b2f6ae8ec5678d6ef2ea0d01532596",
-                "sha256:923dd91618b100bb4c92ab9ed7b65825a595b8524a094ce03c7cb2aaae7d353b",
-                "sha256:9849054e0355e2bc7f4668766a25517ba76095031c9ff5e39ae8949cee5bb024",
-                "sha256:c9d453933f0e3f44b9759189f2a18aa765f7f1a4345c727c18ebe8ad0d748d26",
-                "sha256:cb7514936277abce64c2f4c56883e5704d85ed04d98d2d432d1c6764003bb003"
-            ],
-            "version": "==18.0.2"
+                "sha256:01636e95a88d60118479041c6aaaaf5419c6485b7b1d37c9c4dd424b7b9f1121",
+                "sha256:021dba0d1436516092c624359e5da51472b11ba8edffa334218912f7e8b65467",
+                "sha256:0463bd941b6aead494d4035f7eebd70035293dd6caf8425993e85ad41de13fa3",
+                "sha256:05fd51edd81eed798fccafdd49c936b6c166ffae7b32482e4d6d6a2e196af4e6",
+                "sha256:1fadc8fbdf3d22753c36d4172169d184ee6654f8d6539e7af25029643363c490",
+                "sha256:22efa0596cf245a78a99060fe5682c4cd00c58bb7614271129215c889062db80",
+                "sha256:260c70b7c018905ec3659d0f04db735ac830fe27236e43b9dc0532cf7c9873ef",
+                "sha256:2762c45e289732d4450406cedca35a9d4d71e449131ba2f491e0bf473e3d2ff2",
+                "sha256:2fc6cada8dc53521c1189596f1898d45c5f68603194d3a6453d6db4b27f4e12e",
+                "sha256:343b9710a61f2b167673bea1974e70b5dccfe64b5ed10626798f08c1f7227e72",
+                "sha256:41bf96d5f554598a0632c3ec28e3026f1d6591a50f580df38eff0b8067efb9e7",
+                "sha256:856b2cdf7a1e2cbb84928e1e8db0ea4018709b39804103d3a409e5584f553f57",
+                "sha256:85b869abc894672de9aecdf032158ea8ad01e2f0c3b09ef60e3687fb79418096",
+                "sha256:93f44739db69234c013a16990e43db1aa0af3cf5a4b8b377d028ff24515fbeb3",
+                "sha256:98fa3e75ccb22c0dc99654e3dd9ff693b956861459e8c8e8734dd6247b89eb29",
+                "sha256:9a22c94d2e93af8bebd4fcf5fa38830f5e3b1ff0d4424e2912b07651eb1bafb4",
+                "sha256:a7d3f4b4bbb5d7866ae727763268b5c15797cbd7b63ea17f3b0ec1067da8994b",
+                "sha256:b645a49376547b3816433a7e2d2a99135c8e651e50497e7ecac3bd126e4bea16",
+                "sha256:cf0765822e78cf9e45451647a346d443f66792aba906bc340f4e0ac7870c169c",
+                "sha256:dc398e1e047efb18bfab7a8989346c6921a847feae2cad69fedf6ca12fb99e2c",
+                "sha256:dd5995ae2e80044e33b5077fb4bc2b0c1788ac6feaf15a6b87a00c14b4bdd682",
+                "sha256:e03fe5e07e70f245dc9013a9d48ae8cc4b10c33a1968039c5a3b64b5d01d083d",
+                "sha256:ea09a306144dff2795e48439883349819bef2c53c0ee62a3c2fae429451843bb",
+                "sha256:f4e37f33da282c3c319849877e34f97f0a3acec09622ec61b7333205bdd13b52",
+                "sha256:fa4bad0d1d173dee3e8ef3c3eb6b2bb6c723fc7a661eeecc1ecb2fa99860dd45"
+            ],
+            "version": "==18.1.0"
         },
         "qtconsole": {
             "hashes": [
-                "sha256:4af84facdd6f00a6b9b2927255f717bb23ae4b7a20ba1d9ef0a5a5a8dbe01ae2",
-                "sha256:60d61d93f7d67ba2b265c6d599d413ffec21202fec999a952f658ff3a73d252b"
+                "sha256:40d5d8e00d070ea266dbf6f0da74c4b9597b8b8d67cd8233c3ffd8debf923703",
+                "sha256:b91e7412587e6cfe1644696538f73baf5611e837be5406633218443b2827c6d9"
             ],
-            "version": "==4.5.1"
+            "version": "==4.5.5"
         },
         "requests": {
             "hashes": [
@@ -403,10 +409,10 @@
         },
         "soupsieve": {
             "hashes": [
-                "sha256:72b5f1aea9101cf720a36bb2327ede866fd6f1a07b1e87c92a1cc18113cbc946",
-                "sha256:e4e9c053d59795e440163733a7fec6c5972210e1790c507e4c7b051d6c5259de"
+                "sha256:605f89ad5fdbfefe30cdc293303665eff2d188865d4dbe4eb510bba1edfbfce3",
+                "sha256:b91d676b330a0ebd5b21719cb6e9b57c57d433671f65b9c28dd3461d9a1ed0b6"
             ],
-            "version": "==1.9.2"
+            "version": "==1.9.4"
         },
         "terminado": {
             "hashes": [
@@ -436,17 +442,17 @@
         },
         "traitlets": {
             "hashes": [
-                "sha256:9c4bd2d267b7153df9152698efb1050a5d84982d3384a37b2c1f7723ba3e7835",
-                "sha256:c6cb5e6f57c5a9bdaa40fa71ce7b4af30298fbab9ece9815b5d995ab6217c7d9"
+                "sha256:70b4c6a1d9019d7b4f6846832288f86998aa3b9207c6821f3578a6a6a467fe44",
+                "sha256:d023ee369ddd2763310e4c3eae1ff649689440d4ae59d7485eb4cfbbe3e359f7"
             ],
-            "version": "==4.3.2"
+            "version": "==4.3.3"
         },
         "urllib3": {
             "hashes": [
-                "sha256:b246607a25ac80bedac05c6f282e3cdaf3afb65420fd024ac94435cabe6e18d1",
-                "sha256:dbe59173209418ae49d485b87d1681aefa36252ee85884c31346debd19463232"
+                "sha256:3de946ffbed6e6746608990594d08faac602528ac7015ac28d33cee6a45b7398",
+                "sha256:9a107b99a5393caf59c7aa3c1249c16e6879447533d0887f4336dde834c7be86"
             ],
-            "version": "==1.25.3"
+            "version": "==1.25.6"
         },
         "wcwidth": {
             "hashes": [
@@ -464,10 +470,17 @@
         },
         "widgetsnbextension": {
             "hashes": [
-                "sha256:120f85acc3976450220b03b8933ce48678e518905cca69fc3c856ea5a0144196",
-                "sha256:8c9b4d73e388f2484296be18432d3cc0b8d59de243079a0db16a56c5571e1f86"
+                "sha256:079f87d87270bce047512400efd70238820751a11d2d8cb137a5a5bdbaf255c7",
+                "sha256:bd314f8ceb488571a5ffea6cc5b9fc6cba0adaf88a9d2386b93a489751938bcd"
             ],
-            "version": "==3.5.0"
+            "version": "==3.5.1"
+        },
+        "zipp": {
+            "hashes": [
+                "sha256:3718b1cbcd963c7d4c5511a8240812904164b7f381b647143a89d3b98f9bcd8e",
+                "sha256:f06903e9f1f43b12d371004b4ac7b06ab39a44adc747266928ae6debfa7b3335"
+            ],
+            "version": "==0.6.0"
         }
     },
     "develop": {}