Avoid double builds on PRs in Travis-CI (#29)

ewencp · web-flow · commit dfe212062b75 · 2018-11-20T21:50:07.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -26,3 +26,8 @@ script:
   - cmake .
   - make
   - make test
+
+# Only build master, and only build PR branches once
+branches:
+  only:
+  - master
