Add troubleshooting to main ToC

Author: gaearon

README.md

@@ -121,6 +121,7 @@ The [User Guide](https://github.com/facebookincubator/create-react-app/blob/mast
 - [Running Tests](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#running-tests)
 - [Developing Components in Isolation](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#developing-components-in-isolation)
 - [Deployment](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#deployment)
+- [Troubleshooting](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#troubleshooting)
 
 A copy of the user guide will be created as `README.md` in your project folder.