deps: allow psr/http-message ^2.0

Author: annuh

composer.json

@@ -21,7 +21,7 @@
         "guzzlehttp/psr7": "^1.7 || ^2.0",
         "php-http/promise": "^1.0",
         "psr/cache": "^1.0 || ^2.0 || ^3.0",
-        "psr/http-message": "^1.0",
+        "psr/http-message": "^1.0 || ^2.0",
         "psr/log": "^1.0 || ^2.0",
         "setasign/fpdf": "^1.8",
         "setasign/fpdi": "^2.0",
@@ -65,5 +65,5 @@
         "docs": "https://postnl-php.readthedocs.io/",
         "source": "https://github.com/firstred/postnl-api-php",
         "issues": "https://github.com/firstred/postnl-api-php/issues"
-   }
+    }
 }