PHPUnit now supports phpunit 10

Author: Tim

composer.json

@@ -20,7 +20,7 @@
     "guzzlehttp/guzzle": "~4.0|~5.0|~6.0|~7.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "^5.7 || ^6.5 || ^7.1"
+    "phpunit/phpunit": "^5.7 || ^6.5 || ^7.1 || ^10.1"
   },
   "config": {
     "sort-packages": true