use better source map

yyx990803 · yyx990803 · commit 9ea1e51d6826 · 2017-05-30T15:50:29.000+08:00
diff --git a/shells/dev/webpack.config.js b/shells/dev/webpack.config.js
@@ -48,7 +48,7 @@ module.exports = {
   performance: {
     hints: false
   },
-  devtool: '#cheap-module-eval-source-map',
+  devtool: '#cheap-module-source-map',
   devServer: {
     quiet: true
   },
