Update README to include python 3.6 unit testing

Author: vimalloc

README.md

@@ -32,7 +32,7 @@ $ python setup.py install
 
 ### Testing and Code Coverage
 We require 100% code coverage in our unit tests. We run all the unit tests with tox,
-which will test against python2.7, 3.3, 3.4, and 3.5. Running tox will print out a
+which will test against python2.7, 3.3, 3.4, 3.5 and 3.6. Running tox will print out a
 code coverage report
 ```
 $ tox