fix(travis): only deploy on master branch

StephanGerbeth · StephanGerbeth · commit b094da3b7824 · 2018-09-03T09:56:32.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -23,5 +23,6 @@ before_deploy:
   - npm install --prefix ./functions
 deploy:
   provider: firebase
+  skip_cleanup: true
   on:
     branch: master
