chore(deps): upgrade webpack-sources dep (webpack-contrib#39)

Author: TheLarkInn

package.json

@@ -47,7 +47,7 @@
   },
   "dependencies": {
     "source-map": "^0.5.6",
-    "webpack-sources": "^0.2.3"
+    "webpack-sources": "^1.0.1"
   },
   "devDependencies": {
     "babel-cli": "^6.18.0",