Allow psr/http-message" v2

Author: dereuromark

composer.json

@@ -20,7 +20,7 @@
  "ext-json": "*",
  "ext-mbstring": "*",
  "php-collective/file-storage-factories": "dev-master as 1.0",
- "psr/http-message": "^1.0"
+ "psr/http-message": "^1.0|^2.0"
  },
  "require-dev": {
  "phpstan/phpstan": "^1.10",