!396 语言文件说明不对

Merge pull request !396 from dublog/develop

application/api/lang/zh-cn/user.php

@@ -7,7 +7,7 @@ return [
     'Sign up successful'                    => '注册成功',
     'Username can not be empty'             => '用户名不能为空',
     'Username must be 3 to 30 characters'   => '用户名必须3-30个字符',
-    'Username must be 6 to 30 characters'   => '用户名必须3-30个字符',
+    'Username must be 6 to 30 characters'   => '用户名必须6-30个字符',
     'Password can not be empty'             => '密码不能为空',
     'Password must be 6 to 30 characters'   => '密码必须6-30个字符',
     'Mobile is incorrect'                   => '手机格式不正确',