fix(appveyor): explicitly specify the 2017 OS

jaredcnance · jaredcnance · commit fba7da3f5aad · 2017-03-14T09:06:18.000-05:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -1,4 +1,5 @@
 version: '{build}'
+os: Visual Studio 2017
 pull_requests:
   do_not_increment_build_number: true
 branches:

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,5 @@`
`1`	`1`	`version: '{build}'`
	`2`	`+os: Visual Studio 2017`
`2`	`3`	`pull_requests:`
`3`	`4`	`do_not_increment_build_number: true`
`4`	`5`	`branches:`