Update constraints

Author: driesvints

composer.json

@@ -15,7 +15,7 @@
     ],
     "require": {
         "php": ">=7.1.3",
-        "illuminate/support": "~5.8.0|~5.9.0|^6.0"
+        "illuminate/support": "~5.8.0|^6.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^7.0"