Fix broken link to Feature Branches docs. (#419)

Author: threehams

README.md

@@ -38,7 +38,7 @@ This starter kit contains all the build tooling and configuration you need to ki
 
 Redux/MobX, data persistence, modern styling frameworks and all the other bells and whistles have been explicitly excluded from this starter kit.  It's up to you to decide what technologies you would like to add to your own implementation based upon your own needs.
 
-> However, we now include a set of "feature branches", each implementing a technology on top of the clean master branch.  This provides you with an example on how to integrate said technologies, or use the branches to merge in a configuration that meets your requirements.  See the [`Feature Branches`](/docs/FEATURE_BRANCHES.md) documentation for more.
+> However, we now include a set of "feature branches", each implementing a technology on top of the clean master branch.  This provides you with an example on how to integrate said technologies, or use the branches to merge in a configuration that meets your requirements.  See the [`Feature Branches`](/internal/docs/FEATURE_BRANCHES.md) documentation for more.
 
 ## Getting started