modify http method of v2/bot/richmenu/bulk/unlink
it should be POST, not DELETE.
(see: https://developers.line.biz/ja/reference/messaging-api/#unlink-rich-menu-from-users)
@@ -268,7 +268,7 @@ interface LineMessagingService {
*
* @see LineMessagingClient#unlinkRichMenuIdFromUser(String)
*/
- @DELETE("v2/bot/richmenu/bulk/unlink")
+ @POST("v2/bot/richmenu/bulk/unlink")
Call<Void> unlinkRichMenuIdFromUsers(@Body RichMenuBulkUnlinkRequest request);
/**
