add Laravel 6 constraint

Author: tswonke

composer.json

@@ -25,8 +25,8 @@
         }
     ],
     "require": {
-        "illuminate/support": "~5.5.0|~5.6.0|~5.7.0|~5.8.0",
-        "illuminate/database": "~5.5.0|~5.6.0|~5.7.0|~5.8.0",
+        "illuminate/support": "~5.5.0|~5.6.0|~5.7.0|~5.8.0|~6.0.0",
+        "illuminate/database": "~5.5.0|~5.6.0|~5.7.0|~5.8.0|~6.0.0",
         "php": "~7.1"
     },
     "require-dev": {