Configure appveyor OS

barclayadam · barclayadam · commit ca1410d54892 · 2017-08-25T11:29:08.000+01:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -9,6 +9,8 @@
 # Don't edit manually! Use `build.bat version` command instead!
 version: 2.2.1-build-0{build}
 
+os: Visual Studio 2015
+
 #---------------------------------#
 #    environment configuration    #
 #---------------------------------#
