Update README.

Author: mrstegeman

README.rst

@@ -8,7 +8,7 @@ webthing
 .. image:: https://img.shields.io/badge/license-MPL--2.0-blue.svg
     :target: https://github.com/mozilla-iot/webthing-python/blob/master/LICENSE.txt
 
-Implementation of an HTTP `Web Thing <https://iot.mozilla.org/wot/>`_. This library is compatible with Python 2.7 and 3.4+.
+Implementation of an HTTP `Web Thing <https://iot.mozilla.org/wot/>`_. This library is compatible with Python 2.7 and 3.5+.
 
 Installation
 ============