update README.md

Sven · Sven · commit 63c5935e53c4 · 2017-08-30T10:01:21.000+08:00
diff --git a/README.md b/README.md
@@ -174,7 +174,7 @@ server{
 ```bash
 sudo service nginx restart
 
-// `cd your app`
+// cd your root file
 yarn start
 ```
 
