Fixing linting issues

src/app.js

@@ -208,11 +208,11 @@ function onError (error) {
     case 'EACCES':
       console.error(`${bind} requires elevated privileges`)
       process.exit(1)
-      // break
+      break
     case 'EADDRINUSE':
       console.error(`${bind} is already in use`)
       process.exit(1)
-      // break
+      break
     default:
       throw error
   }