Update .travis.yml

ChrisRackauckas · web-flow · commit c4a5e2ac4a6e · 2020-09-06T13:10:47.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,9 @@
 # Documentation: http://docs.travis-ci.com/user/languages/julia/
 language: julia
+# avoid duplicate tests in PRs
+branches:
+  only:
+    - master
 os:
   - linux
   # - osx
