use previous build os

niemyjski · niemyjski · commit b051f256a12f · 2016-04-11T17:15:32.000-05:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -1,6 +1,7 @@
 version: 3.4.{build}
 clone_depth: 2
 configuration: Release
+os: Previous Visual Studio 2015
 
 #environment:
 #  VERSION_SUFFIX: -preview
