add support information to readme

Author: kevin1024

README.md

@@ -9,6 +9,10 @@ deferring to an oauth2 provider.
 
 If you use this package, you should install the latest development version of `request_oauthlib` in order to get [an important commit that fixes a CSRF vulnerability](https://github.com/requests/requests-oauthlib/commit/c5cad15edc28040f85dba52ceebb18e11bd9e759)
 
+# Support
+
+django-admin-oauth2 should support Python 2.6, 2.7, pypy, and Django versions 1.4 through 1.7
+
 ## Installation
 
 Step 1: `pip install django-admin-oauth2` and include it in your project's requirements