Allow newer illuminate/support lib

Laravel 5.7 comes with Illuminate/Support 5.7 (and does not allow lower versions to be installed).

Author: emmerink

composer.json

@@ -13,7 +13,7 @@
     ],
     "require": {
       "php": ">=5.6.4",
-      "illuminate/support": "5.1.* || 5.2.* || 5.3.* || 5.4.* || 5.5.* || 5.6.*"
+      "illuminate/support": "5.1.* || 5.2.* || 5.3.* || 5.4.* || 5.5.* || 5.6.* || 5.7.*"
     },
 
     "autoload": {