Correct typing mistake

Author: adisaf

README.md

@@ -43,7 +43,7 @@ php artisan vendor:publish --tag=laravel-admin-summernote
 ```php
     'config' => [
         'lang'   => 'zh-CN',
-        'hegiht' => 500,
+        'height' => 500,
     ]
 ```
 
@@ -62,4 +62,4 @@ $form->summernote('content');
 
 License
 ------------
-Licensed under [The MIT License (MIT)](LICENSE).
+Licensed under [The MIT License (MIT)](LICENSE).