Only do two runs on AppVeyor instead of four. (#3242)

Windows Python wheels are version-independent.

Author: gvanrossum

appveyor.yml

@@ -1,14 +1,6 @@
 environment:
   matrix:
 
-    - PYTHON: "C:\\Python35"
-      PYTHON_VERSION: "3.5.1"
-      PYTHON_ARCH: "32"
-
-    - PYTHON: "C:\\Python35-x64"
-      PYTHON_VERSION: "3.5.1"
-      PYTHON_ARCH: "64"
-
     - PYTHON: "C:\\Python36"
       PYTHON_VERSION: "3.6.x"
       PYTHON_ARCH: "32"