fix(package): update moment to version 2.19.1

Closes #1766

Author: greenkeeper[bot]

package.json

@@ -60,7 +60,7 @@
     "html-entities": "1.2.1",
     "htmlparser2": "3.9.2",
     "lodash": "4.17.4",
-    "moment": "2.18.1",
+    "moment": "2.19.1",
     "moment-timezone": "0.5.13",
     "querystring": "0.2.0",
     "react": "16.0.0-alpha.12",