Update dependencies

Author: judgej

composer.json

@@ -21,14 +21,13 @@
     "require": {
         "php": "^7.4|^8.0",
         "shrikeh/teapot": "^1.0|^2.0",
-        "psr/http-message": "~1.0",
+        "psr/http-message": "^1.0",
         "alcohol/iso4217": "^4.0"
     },
     "suggest": {
         "moneyphp/money": "^3.0",
         "guzzlehttp/psr7": "^1.2.0",
-        "guzzlehttp/guzzle": "~6.0",
-        "zendframework/zend-diactoros": "~1.3"
+        "guzzlehttp/guzzle": "^6.0|^7.0|^8.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8.0"