chore(package): update dependencies

Author: greenkeeper[bot]

package.json

@@ -26,12 +26,12 @@
     "aws lambda"
   ],
   "devDependencies": {
-    "@types/fs-extra": "2.0.0",
-    "@types/jest": "^19.2.4",
+    "@types/fs-extra": "4.0.2",
+    "@types/jest": "^21.1.1",
     "@types/lodash": "^4.14.62",
-    "jest": "^20.0.4",
+    "jest": "^21.2.1",
     "mock-fs": "^4.3.0",
-    "ts-jest": "^20.0.6",
+    "ts-jest": "^21.0.1",
     "tslint": "^5.1.0"
   },
   "dependencies": {