Add support for Laravel 5.7

Author: DivineOmega

composer.json

@@ -6,9 +6,9 @@
     "license": "LGPL-3.0-only",
     "require": {
         "php": ">=5.5.9",
-        "illuminate/contracts": "5.1.*|5.2.*|5.3.*|5.4.*|5.5.*|5.6.*",
-        "illuminate/http": "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.*"
+        "illuminate/contracts": "^5.1",
+        "illuminate/http": "^5.1",
+        "illuminate/support": "^5.1"
     },
     "autoload": {
         "psr-4": {