Fix Codeclimate issues

Codeclimate found some issues on my Javascript styling, I've fixed those problems.

Author: Claudio Ludovico Panetta

src/store/states.js

@@ -11,5 +11,5 @@ export const state = {
      * List of photos available inside
      * the gallery.
      */
-    photos: [],
+    photos: []
 };

src/store/store.js

@@ -18,5 +18,5 @@ import {mutations} from "./mutations";
 export const store = new Vuex.Store({
     state,
     getters,
-    mutations,
+    mutations
 });

webpack.config.js

@@ -28,7 +28,7 @@ module.exports = {
         options: {
           name: '[name].[ext]?[hash]'
         }
-      },
+      }
     ]
   },
   resolve: {