[appveyor] Only build from master

"master" only builds on "push to master" events "PR" only builds from "PR to master" events
2018-12-23 16:44:21 -08:00 · 2018-12-23 16:44:21 -08:00 · a9a1b5cee1
commit a9a1b5cee1
--- a/appveyor.yml
+++ b/appveyor.yml
@ -7,7 +7,7 @@
 branches:
  # whitelist
  only:
-    - appveyor
+    - master

 image: Visual Studio 2017
 environment: