Allow psr/http-message v2 (#21)

Author: devanych

composer.json

@@ -21,7 +21,7 @@
     "require": {
         "php": "^7.4|^8.0",
         "psr/http-factory": "^1.0",
-        "psr/http-message": "^1.0"
+        "psr/http-message": "^1.1|^2.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.5",