fix(firebase): test deploy

Author: StephanGerbeth

.travis.yml

@@ -19,4 +19,4 @@ script:
 after_success:
   - npm run travis-deploy-once "npm run semantic-release"
   - npm install --prefix ./functions
-  - firebase deploy --functions --token=${FIREBASE_TOKEN}
+  - firebase deploy --only functions --token "${FIREBASE_TOKEN}"