Update composer.json

Author: edenleung

composer.json

@@ -16,7 +16,7 @@
     "minimum-stability": "dev",
     "require": {
         "topthink/framework": "6.0.*|5.1.*",
-        "guzzlehttp/guzzle": "^6.4"
+        "guzzlehttp/guzzle": "^5.0|^6.0|^7.0"
     },
     "autoload": {
         "psr-4": {