Update README.markdown

Updated README to inform users Compass is no longer supported.

Author: JamesTheHacker

README.markdown

@@ -1,5 +1,7 @@
 # Compass Stylesheet Authoring Framework
 
+**Depreciated:** Compass is no longer supported.
+
 Build Status: [![Build Status](https://travis-ci.org/Compass/compass.png)](https://travis-ci.org/Compass/compass)
 
 Code Quality: [![Code Climate](https://codeclimate.com/github/Compass/compass.png)](https://codeclimate.com/github/Compass/compass)