Revert "Have Travis test firestore-master"

wilhuff · Corrob · commit b84ecde356da · 2019-04-22T12:57:46.000-07:00
This reverts commit 9d0f07b.
diff --git a/.travis.yml b/.travis.yml
@@ -293,4 +293,3 @@ jobs:
 branches:
   only:
     - master
-    - firestore-master
