DX: allow XDebugHandler v2

composer.json

@@ -18,7 +18,7 @@
         "ext-json": "*",
         "ext-tokenizer": "*",
         "composer/semver": "^1.4 || ^2.0 || ^3.0",
-        "composer/xdebug-handler": "^1.2",
+        "composer/xdebug-handler": "^1.2 || ^2.0",
         "doctrine/annotations": "^1.2",
         "php-cs-fixer/diff": "^1.3",
         "symfony/console": "^3.4.43 || ^4.1.6 || ^5.0",