chore: add 5.2.x to CI tested branches (#9902)

mmalerba · mmalerba · commit 839098219362 · 2018-02-12T09:02:20.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -18,6 +18,7 @@ addons:
 branches:
   only:
   - master
+  - 5.2.x
 
 jobs:
   include:
