Use official AppVeyor builder w/ Docker

StefanScherer · StefanScherer · commit 129f3d51bfe0 · 2017-03-10T07:08:48.000+01:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -1,5 +1,5 @@
 version: 1.0.{build}
-image: Windows Server 2016
+image: Visual Studio 2017
 
 environment:
   DOCKER_USER:
