fix(travis): only deploy on master branch

Author: StephanGerbeth

.travis.yml

@@ -18,11 +18,9 @@ script:
   - npm run build
 after_success:
   - npm run travis-deploy-once "npm run semantic-release"
+  # - npm install --prefix ./functions
+  # - firebase deploy --only functions --token "${FIREBASE_TOKEN}"
 deploy:
-  - provider: script
-    skip_cleanup: true
-    script:
-      - npm install --prefix ./functions
-      - firebase deploy --only functions --token "${FIREBASE_TOKEN}"
-    on:
-      branch: master
+  provider: firebase
+  on:
+    branch: master