Fix spell

Author: kitchenu

README.md

@@ -25,8 +25,7 @@ echo $response->mail;
 // mail@example.com
 ```
 
-How to call endpoint
-POST  /rooms/{room_id}/messages
+How to call endpoint ( POST /rooms/{room_id}/messages )
 
 ```php
 $client->request('POST', 'rooms/123456789/messages', ['body' => 'Hello']);

src/Client.php

@@ -194,7 +194,7 @@ protected function requestOptions($method, array $params)
         if ($method == 'GET') {
             $options['query'] = $params;
         } else {
-            $options['form_paramss'] = $params;
+            $options['form_params'] = $params;
         }
 
         return $options;