Merge pull request #18 from Barzahlen/martinseener-update-travisciconf

Removed deprecated PHP versions and added 7.2

.travis.yml

@@ -13,12 +13,10 @@ script: ./vendor/bin/phpunit
 
 matrix:
     include:
-        - php: 5.3
-        - php: 5.4
-        - php: 5.5
         - php: 5.6
         - php: 7.0
         - php: 7.1
+        - php: 7.2
         - php: hhvm-3.18
           sudo: required
           dist: trusty