Added symfony support for 5.2

Author: nickdebest

composer.json

@@ -14,10 +14,10 @@
   "minimum-stability": "dev",
   "prefer-stable": true,
   "require": {
-    "php": ">=7.2.0",
+    "php": ">=7.3.0",
     "api-platform/api-pack": "^1.2",
     "doctrine/doctrine-bundle": "^1.10",
-    "doctrine/orm": "~2.6.3",
+    "doctrine/orm": "^2.7",
     "ramsey/uuid-doctrine": "^1.5",
     "symfony/workflow": "^4.4|^5.2",
     "symfony/validator": "^4.4|^5.2",