取消订阅。此接口后续版本将移除，请使用Subscription: unsubscribe。
Request
HTTP request
POST https://www.featapi.com/api/subscription/user-subscription/unsubscribe/
BODY
| Key | Type | Required? | Description | Notes |
| followed_user_uid | uid | No | 被订阅者的uid | 订阅类型为用户时必填 |
| followed_category_id | integer | No | 分类id | 订阅类型为分类时必填 |
| subscription_type | enum | Yes | 订阅类型 | Subscription.Type |
| entity_type | enum | Yes | 内容类型 | Subscription.EntityType |
Response
204
取消订阅成功。