Update README.md

Author: cloudwebrtc

README.md

@@ -3,7 +3,7 @@ A simple WebRTC Signaling server for flutter-webrtc and html5.
 
 ## Usage
 - Clone the repository, run `npm install`.  
-- Run `npm run` and open https://localhost:8086 to use html5 demo. 
+- Run `npm start` and open https://localhost:8086 to use html5 demo. 
 - If you need to test mobile app, please check the [webrtc-flutter](https://github.com/cloudwebrtc/flutter-webrtc/tree/master/example) plug-in. 
 
 ## screenshots