Readme update

README.md

@@ -75,15 +75,15 @@ $GOPATH/bin/bra run
 Rebuild on file change, and serve them by Grafana's webserver (http://localhost:3000):
 
 ```bash
-yarn watch
+yarn start
 ```
 
 Build the assets, rebuild on file change with Hot Module Replacement (HMR), and serve them by webpack-dev-server (http://localhost:3333):
 
 ```bash
-yarn start
+yarn start:hot
 # OR set a theme
-env GRAFANA_THEME=light yarn start
+env GRAFANA_THEME=light yarn start:hot
 ```
 
 *Note: HMR for Angular is not supported. If you edit files in the Angular part of the app, the whole page will reload.*