Fix serialization of video stickers

CHANGELOG.md

@@ -23,8 +23,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed 
 
 - `SetWebhook` request can now properly send certificate ([#250][pr250])
+- Serialization of `InputSticker::Webm` ([#252][pr252])
 
 [pr250]: https://github.com/teloxide/teloxide-core/pull/250
+[pr252]: https://github.com/teloxide/teloxide-core/pull/252
 
 ### Deprecated
 

src/types/input_sticker.rs

@@ -34,5 +34,6 @@ pub enum InputSticker {
     /// WEBM video with the sticker, uploaded using multipart/form-data.
     ///
     /// See <https://core.telegram.org/stickers#video-sticker-requirements> for technical requirements.
+    #[serde(rename = "webm_sticker")]
     Webm(InputFile),
 }