Remove 3.5 from appveyor

Author: bryanforbes

.ci/appveyor.yml

@@ -12,8 +12,6 @@ environment:
             secure: XudOvV6WtY9yRoqKahXMswFth8SF1UTnSXws4UBjeqzQUjOx2V2VRvIdpPfiqUKt
 
     matrix:
-        - PYTHON: "C:\\Python35\\python.exe"
-        - PYTHON: "C:\\Python35-x64\\python.exe"
         - PYTHON: "C:\\Python36\\python.exe"
         - PYTHON: "C:\\Python36-x64\\python.exe"
         - PYTHON: "C:\\Python37\\python.exe"