Add missing semi-colon

Author: alOneh

lib/config-generator.js

@@ -414,7 +414,7 @@ class ConfigGenerator {
         plugins.push(new AssetsOutputDisplayPlugin(outputPath, friendlyErrorsPlugin));
 
         if (this.webpackConfig.useDevServer()) {
-            plugins.push(new webpack.HotModuleReplacementPlugin())
+            plugins.push(new webpack.HotModuleReplacementPlugin());
         }
 
         return plugins;