Merge pull request #28 from mezzio/renovate/psr-http-message-2.x

Update dependency psr/http-message to v2

Author: Ocramius

composer.json

@@ -37,7 +37,7 @@
         "mezzio/mezzio-authentication": "^1.0",
         "psr/container": "^1.0 || ^2.0",
         "psr/http-factory": "^1.0",
-        "psr/http-message": "^1.0.1"
+        "psr/http-message": "^1.0.1 || ^2.0.0"
     },
     "require-dev": {
         "laminas/laminas-coding-standard": "~2.5.0",