mention refreshing the browser to see changes

Author: ianhi

{{cookiecutter.github_project_name}}/README.md

@@ -67,5 +67,7 @@ And in a separate session, begin watching the source directory for changes:
 npm run watch
 ```
 
+After a change wait for the build to finish and then refresh your browser and the changes should take effect.
+
 #### Python:
 If you make a change to the python code then you will need to restart the notebook kernel to have it take effect.