Merge pull request preboot#57 from jairovsky/fix-npm-watch-doc

fix 'npm run watch' docs

Author: phra

README.md

@@ -75,7 +75,7 @@ It will start a local server using `webpack-dev-server` which will watch, build
 ### Build files
 
 * single run: `npm run build`
-* build files and watch: `npm run watch`
+* build files and watch: `npm start`
 
 ## Testing