fix invalid json

Author: TheGeekyM

composer.json

@@ -23,7 +23,7 @@
     "require": {
         "php": ">=7.1.0",
         "symfony/http-foundation": "^4.4|^5.0",
-        "symfony/validator": "5.1.*",
+        "symfony/validator": "5.1.*"
     },
     "require-dev": {
         "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0",