Set PHP >= 7.2

Author: j-guyon

composer.json

@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "php": "^7.1",
+        "php": "^7.2",
         "symfony/console": "^3.4|^4.3|^5.0",
         "doctrine/orm": "^2.5.11",
         "doctrine/doctrine-bundle": "^1.6.10|^2.0",