Merge pull request #59 from someniatko/allow-psr-http-message-v2

support psr/http-message v2

Author: kevinsmith

composer.json

@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": ">=7.2",
-        "psr/http-message": "~1.0",
+        "psr/http-message": "~1.0 || ~2.0",
         "psr/http-server-handler": "~1.0",
         "psr/http-server-middleware": "^1.0"
     },