Merge pull request #19 from windhoney/develop

文档bug

Author: windhoney

README.md

@@ -68,7 +68,7 @@ yii migrate --migrationPath=@vendor/windhoney/yii2-rest-rbac/migrations
 yii migrate --migrationPath=@yii/rbac/migrations/
 ```
 
-> **_**`auth_item` 表添加一个字段 `parent_name` varchar(30) COLLATE utf8_unicode_ci DEFAULT '' COMMENT '父级名称'**_**,
+> **`auth_item` 表添加一个字段 `parent_name` varchar(30) COLLATE utf8_unicode_ci DEFAULT '' COMMENT '父级名称'**,
 ###### 3. oauth2相关表
 
 ```php