Fix Travis testing (#196)

* Test with Martijn's branch

* Fix url

* Try with own branch

Author: Minishlink

.travis.yml

@@ -25,7 +25,7 @@ before_install:
   - nvm install node
 
 install:
-  - npm install github:GoogleChromeLabs/web-push-testing-service -g
+  - npm install github:Minishlink/web-push-testing-service#update/deps -g
 
 before_script:
   - composer install --prefer-source -n