Allow laravel 5.5

Author: jimmypuckett

composer.json

@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": ">=5.5.0",
-        "illuminate/support": "~5.1.10|5.2.*|5.3.*|5.4.*",
+        "illuminate/support": "~5.1.10|5.2.*|5.3.*|5.4.*|5.5.*",
         "swiftmailer/swiftmailer": "~5.1"
     },
     "require-dev": {
@@ -38,6 +38,8 @@
         }
     },
     "config": {
-        "preferred-install": "dist"
-    }
+        "sort-packages": true
+    },
+    "minimum-stability": "dev",
+    "prefer-stable": true
 }