allow with symfony5

Author: andreybolonin

composer.json

@@ -47,7 +47,7 @@
         "doctrine/mongodb-odm": ">=1.0.2 <2.0",
         "doctrine/orm": ">=2.5.0",
         "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5",
-        "symfony/yaml": "~2.6 || ~3.0 || ~4.0"
+        "symfony/yaml": "^2.6 || ^3.0 || ^4.0 || ^5.0"
     },
     "suggest": {
         "doctrine/mongodb-odm": "to use the extensions with the MongoDB ODM",