typo fix

Author: mastashake08

composer.json

@@ -1,7 +1,7 @@
 {
     "name": "mastashake08/laravel-openai-api",
     "description": "Add an OpenAI API and Artisan command easily into your projects. Generate images, or text. Can be integrated with Laravel Sanctum for token based access.",
-    "version": "1.7.8",
+    "version": "1.7.9",
     "keywords": [
         "mastashake08",
         "laravel",

src/LaravelOpenaiApi.php

@@ -8,7 +8,7 @@
 class LaravelOpenaiApi
 {
   function generateChat(array $data): Prompt {
-    $result = $client->chat()->create($data);
+    $result = OpenAI::chat()->create($data);
     return $result;
   }