Comment out unused python versions.

Author: drvinceknight

appveyor.yml

@@ -1,7 +1,5 @@
 environment:
   matrix:
-    #- PYTHON: "C:\\Python27"
-    #- PYTHON: "C:\\Python34"
     - PYTHON: "C:\\Python35"
 install:
   - "%PYTHON%\\python.exe -m pip install -r requirements.txt"