Add notice about deprecating this repo.

Author: robertam3

README.md

@@ -1,3 +1,7 @@
+# Important Note
+
+**This repo is no longer used by our Chrome Watcher.** We updated that project to use better maintained version of this gem in https://github.com/Rigor/chrome-watcher/pull/8. Functionally there should be no change in behavior but we can keep this repo around until we're confident the Chrome Watcher is working.
+
 # deb-s3
 
 [![Build Status](https://travis-ci.org/krobertson/deb-s3.svg?branch=master)](https://travis-ci.org/krobertson/deb-s3)