Update README to add 3.5 and 3.6 compatibility

Author: fpietka

README.md

@@ -45,7 +45,7 @@ Project status
 The project is test with:
 * MySQL 5.5, 5.6 and 5.7
 * Python >= 2.6
-* Python 3.3 and 3.4 (3.2 is not supported)
+* Python 3.3, 3.4, 3.5 and 3.6 (3.2 is not supported)
 * PyPy (really faster than the standard Python interpreter)
 
 The project is used in production for critical stuff in some