Bumping web push version

Author: Matt Gaunt

.travis.yml

@@ -13,7 +13,7 @@ before_install:
   - nvm install node
 
 install:
-  - npm install web-push-testing-service@0.2.1 -g
+  - npm install web-push-testing-service@0.3.0 -g
 
 before_script:
   - composer install --prefer-source -n --no-dev