update composer

Author: bonroyage

composer.json

@@ -2,7 +2,7 @@
   "name": "bonroyage/tripleseat",
   "description": "Tripleseat API interface",
   "license": "MIT",
-  "type": "project",
+  "type": "library",
   "require": {
     "php": ">=7.1",
     "ext-json": "*",
@@ -14,14 +14,18 @@
   "require-dev": {
     "phpunit/phpunit": "^8.5",
     "guzzlehttp/psr7": "^1.6",
-    "guzzlehttp/guzzle": "~6.0",
-    "php-http/guzzle6-adapter": "^2.0",
+    "guzzlehttp/guzzle": "7.0.1",
+    "php-http/guzzle7-adapter": "0.1.1",
     "http-interop/http-factory-guzzle": "^1.0",
     "symfony/var-dumper" : "5.2.x-dev"
   },
   "autoload": {
     "psr-4": {
       "Tripleseat\\": "src"
     }
+  },
+  "suggest": {
+    "guzzlehttp/guzzle": "Use Guzzle ^7 as HTTP client",
+    "http-interop/http-factory-guzzle": "Factory for guzzlehttp/guzzle"
   }
 }