Update README.md

Author: steinfletcher

README.md

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 [![Build Status](https://img.shields.io/travis/JSainsburyPLC/ui-dev-proxy.svg?logo=travis&style=for-the-badge)](https://travis-ci.org/JSainsburyPLC/ui-dev-proxy)
 
-Proxy tool for development of UIs.
+Proxy tool for development of UIs. Supports mocks, http redirects and URL rewriting. 
 
 ## Installation