Upgrade underscore to 1.9.0 (from 1.8.3)

Author: bdukes

package.json

@@ -70,7 +70,7 @@
     "tableexport": "4.0.11",
     "tinymce": "4.7.12",
     "tota11y": "0.1.6",
-    "underscore": "1.8.3",
+    "underscore": "1.9.0",
     "unitegallery": "1.7.28",
     "urijs": "1.19.1",
     "xlsx": "0.11.19",

yarn.lock

@@ -5668,9 +5668,9 @@ unc-path-regex@^0.1.0:
   version "0.1.2"
   resolved "https://registry.yarnpkg.com/unc-path-regex/-/unc-path-regex-0.1.2.tgz#e73dd3d7b0d7c5ed86fbac6b0ae7d8c6a69d50fa"
 
-underscore@1.8.3:
-  version "1.8.3"
-  resolved "https://registry.yarnpkg.com/underscore/-/underscore-1.8.3.tgz#4f3fb53b106e6097fcf9cb4109f2a5e9bdfa5022"
+underscore@1.9.0:
+  version "1.9.0"
+  resolved "https://registry.yarnpkg.com/underscore/-/underscore-1.9.0.tgz#31dbb314cfcc88f169cd3692d9149d81a00a73e4"
 
 union-value@^1.0.0:
   version "1.0.0"