Fix composer.json syntax error

Author: mathieutu

composer.json

@@ -26,7 +26,7 @@
         "phpunit/phpunit": "^8.3|^9.0",
         "symfony/property-access": "^4.0|^5.0",
         "symfony/serializer": "^4.0|^5.0",
-        "symfony/yaml": "^4.0|^5.0",
+        "symfony/yaml": "^4.0|^5.0"
     },
     "autoload": {
         "psr-4": {