ci: only run CI on master

BurntSushi · BurntSushi · commit 4152e185fedc · 2017-12-30T14:50:41.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -26,3 +26,6 @@ env:
 notifications:
   email:
     on_success: never
+branches:
+  only:
+    - master
diff --git a/appveyor.yml b/appveyor.yml
@@ -10,8 +10,9 @@ install:
   - SET PATH=%PATH%;C:\MinGW\bin
   - rustc -V
   - cargo -V
-
 build: false
-
 test_script:
   - cargo test --verbose --jobs 4
+branches:
+  only:
+    - master
