fix devtool

config/index.js

@@ -36,7 +36,7 @@ module.exports = {
      */
 
     // https://webpack.js.org/configuration/devtool/#development
-    devtool: '#cheap-source-map',
+    devtool: 'cheap-source-map',
 
     // If you have problems debugging vue-files in devtools,
     // set this to false - it *may* help
@@ -73,7 +73,7 @@ module.exports = {
      */
     productionSourceMap: false,
     // https://webpack.js.org/configuration/devtool/#production
-    devtool: '#source-map',
+    devtool: 'source-map',
 
     // Gzip off by default as many popular static hosts such as
     // Surge or Netlify already gzip all static assets for you.