Test against higher php versions

Author: hannesvdvreken

.travis.yml

@@ -3,6 +3,8 @@ language: php
 php:
   - 5.5
   - 5.6
+  - 7.0
+  - 7.1
 
 env:
   - LARAVEL_VERSION="4.2.*"

composer.json

@@ -11,7 +11,7 @@
         }
     ],
     "require": {
-        "php": ">=5.4.0",
+        "php": ">=5.5.0",
         "illuminate/support": ">=4.2",
         "illuminate/database": ">=4.2",
         "get-stream/stream": "~2.2"