Cut down to a single appveyor build

appveyor.yml

@@ -9,10 +9,6 @@ environment:
       PYTHON_VERSION: "3.5.x"
       PYTHON_MAJOR: 3
       PYTHON_ARCH: "64"
-    - PYTHON: "C:\\Python27"
-      PYTHON_VERSION: "2.7.x"
-      PYTHON_MAJOR: 2
-      PYTHON_ARCH: "32"
 
 # build cache to preserve files/folders between builds
 cache: