[3.6] bpo-34575: Build with only VS2015 on AppVeyor (GH-9066)

Remove VS2017 image from AppVeyor config.

We're currently having caching issues between the two images, and VS2017 builds are tested by VSTS.  Removing that one here will significantly decrease the time that AppVeyor builds take on this branch.

diff --git a/.github/appveyor.yml b/.github/appveyor.yml
index 09eb7db0f0d46d22b2bb3bd8e4aaf47b6734e396..3e0f588a2892e89ce33366f519da4ca73d2066fb 100644 (file)
--- a/.github/appveyor.yml
+++ b/.github/appveyor.yml
@@ -36,4 +36,3 @@ environment:
   HOST_PYTHON: C:\Python36\python.exe
 image:
   - Visual Studio 2015
-  - Visual Studio 2017