Add causes of dev server not detecting changes (!1422) · Merge requests · Meta / create-react-app

Merged Administrator requested to merge github/fork/jetpackpony/patch-1 into master Jan 20, 2017

Created by: jetpackpony

Added a summary of causes of npm start not detecting changes to Troubleshooting chapter of User Guide. Collected from #659 (closed) and #1374 (closed)