Upgrade vue-loader (#723)

The vue-loader build error caused by Prettier have been fixed

package.json

@@ -95,7 +95,7 @@
     "svg-sprite-loader": "3.5.2",
     "uglifyjs-webpack-plugin": "1.1.3",
     "url-loader": "0.6.2",
-    "vue-loader": "13.5.0",
+    "vue-loader": "13.7.2",
     "vue-style-loader": "3.0.3",
     "vue-template-compiler": "2.5.10",
     "webpack": "3.10.0",