chore(deps): update webpack to 3.12.0 (#1477)

Author: potremblay

package.json

@@ -55,7 +55,7 @@
     "tslint": "^5.8.0",
     "tslint-eslint-rules": "^4.1.1",
     "uglify-es": "3.2.2",
-    "webpack": "3.8.1",
+    "webpack": "3.12.0",
     "ws": "3.3.2",
     "xml2js": "^0.4.19"
   },