Merge pull request #333 from Enalean/php-7.2

Run tests against PHP 7.2 on Travis CI

.travis.yml

@@ -13,6 +13,7 @@ matrix:
     - php: 5.6
     - php: 7.0
     - php: 7.1
+    - php: 7.2
     - php: hhvm
       dist: trusty