fix: added webpack as dev dependency

Author: Chrisimir

package.json

@@ -49,7 +49,7 @@
     "vue-loader": "^14.2.2",
     "vue-style-loader": "^1.0.0",
     "vue-template-compiler": "^2.5.16",
-    "webpack": "^2.1.0-beta.2",
+    "webpack": "^2.7.0",
     "webpack-dev-server": "^3.1.11",
     "webpack-merge": "^0.14.1"
   }