Revert "try and use vs2013"

niemyjski · niemyjski · commit 29070ea02efa · 2015-03-03T08:08:44.000-06:00
This reverts commit 76bf826.
diff --git a/appveyor.yml b/appveyor.yml
@@ -3,7 +3,6 @@ clone_depth: 2
 configuration: Release
 
 environment:
-  MSVS_VERSION: 2013
   VERSION_SUFFIX: -preview
 
 init:
