Require Laravel 5.5 or greater

Due to bug and security fixes for Laravel 5.4 and below being discontinued, Adldap2-Laravel will now require Laravel 5.5 or greater.

Author: stevebauman

composer.json

@@ -6,7 +6,8 @@
     "type": "project",
     "require": {
         "php": ">=7.1",
-        "adldap2/adldap2": "^10.0"
+        "adldap2/adldap2": "^10.0",
+        "illuminate/support": "~5.5.0|~5.6.0|~5.7.0|~5.8.0"
     },
     "require-dev": {
         "mockery/mockery": "~1.0",