Update README with yarn commands
## Sensu Dashboard
-### `npm start`
+### `yarn start`
Starts a webpack server that listens on
[http://localhost:3030](http://localhost:3030) for easier development (the page
@@ -9,7 +9,7 @@ will reload if you make edits).
We use webpack proxy mechanism (see `proxy` attribute in `package.json`) to
forward requests destined to the API in order to avoid any CORS issue.
-### `npm run build`
+### `yarn run build`
Builds the app for production to the build folder. It correctly bundles React in
production mode and optimizes and minifies the build for the best performance.
