Fix parsing for posts in private channels

src/types/message.rs

@@ -35,7 +35,7 @@ pub enum MessageKind {
     Common {
         /// Sender, empty for messages sent to channels.
         #[serde(flatten)]
-        from: Sender,
+        from: Option<Sender>,
 
         #[serde(flatten)]
         forward_kind: ForwardKind,
@@ -352,7 +352,7 @@ mod getters {
         /// NOTE: this is getter for both `from` and `author_signature`
         pub fn from(&self) -> Option<&Sender> {
             match &self.kind {
-                Common { from, .. } => Some(from),
+                Common { from, .. } => from.as_ref(),
                 _ => None,
             }
         }

src/types/message_entity.rs

@@ -116,14 +116,14 @@ mod tests {
                 photo: None,
             },
             kind: MessageKind::Common {
-                from: Sender::User(User {
+                from: Some(Sender::User(User {
                     id: 0,
                     is_bot: false,
                     first_name: "".to_string(),
                     last_name: None,
                     username: None,
                     language_code: None,
-                }),
+                })),
                 forward_kind: ForwardKind::Origin {
                     reply_to_message: None,
                 },

src/types/update.rs

@@ -158,14 +158,14 @@ mod test {
                     photo: None,
                 },
                 kind: MessageKind::Common {
-                    from: Sender::User(User {
+                    from: Some(Sender::User(User {
                         id: 218_485_655,
                         is_bot: false,
                         first_name: String::from("Waffle"),
                         last_name: None,
                         username: Some(String::from("WaffleLapkin")),
                         language_code: Some(LanguageCode::EN),
-                    }),
+                    })),
                     forward_kind: ForwardKind::Origin {
                         reply_to_message: None,
                     },