update travis config

grouma · grouma · commit 6d7ced48c0f7 · 2019-02-15T12:32:07.000-08:00
diff --git a/pkgs/sse/.travis.yml b/pkgs/sse/.travis.yml
@@ -40,3 +40,8 @@ script:
 cache:
  directories:
    - $HOME/.pub-cache
+
+# Only building master means that we don't run two builds for each pull request.
+branches:
+  only:
+    - master
