don't try to build because there's no mcrypt extension (required by laravel 5.0) in php 7.2

Author: hannesvdvreken

.travis.yml

@@ -21,6 +21,8 @@ matrix:
     env: LARAVEL_VERSION="5.5.*"
   - php: 5.6
     env: LARAVEL_VERSION="5.5.*"
+  - php: 7.2
+    env: LARAVEL_VERSION="5.0.*"
 
 before_script:
   - travis_retry composer self-update