Allow psr/http-message v2

Author: tobyzerner

CHANGELOG.md

@@ -21,6 +21,7 @@ and this project adheres to
 - Add the ability to add `after` callbacks to the `Create` endpoint
 - Add the ability to pass a condition to `writableOnCreate`
 - Add `Relationship::notIncludable()`
+- Allow `psr/http-message` v2
 - Laravel: Add `ToOne` and `ToMany` subclasses which support constraining
   relationship queries
   ([#103](https://github.com/tobyzerner/json-api-server/pull/103) by @SychO9)

composer.json

@@ -7,7 +7,7 @@
         "asispts/http-accept": "^1.0",
         "doctrine/inflector": "^2.0",
         "nyholm/psr7": "^1.8",
-        "psr/http-message": "^1.0",
+        "psr/http-message": "^1.0|^2.0",
         "psr/http-server-handler": "^1.0"
     },
     "license": "MIT",