tox: fix checkqa envlist entries (#525)

Author: blueyed

tox.ini

@@ -8,7 +8,7 @@ envlist =
     - pypy3-pytest3-django1.8-{sqlite,sqlite_file}
     - pypy3-pytest2-django1.8-sqlite_file
     - pypy-pytest3-django1.10-sqlite_file
-    - py{35,py27}-checkqa
+    - py{36,27}-checkqa
 
 [testenv]
 deps =