Update CHANGELOG and remove unused imports

CHANGELOG.md

@@ -27,6 +27,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- Type of `PublicChatSupergroup::slow_mode_delay` field: `Option<i32>`=> `Option<u32>` ([#80][pr80]) 
 - Add missing `Chat::message_auto_delete_time` field ([#80][pr80]) 
 - `SendChatAction` output type `Message` => `True` ([#75][pr75])
 - `GetChatAdministrators` output type `ChatMember` => `Vec<ChatMember>` ([#73][pr73])

src/types/message.rs

@@ -3,12 +3,10 @@
 use serde::{Deserialize, Serialize};
 
 use crate::types::{
-    chat::{ChatKind, PublicChatKind},
-    Animation, Audio, Chat, ChatPublic, Contact, Dice, Document, Game, InlineKeyboardMarkup,
-    Invoice, Location, MessageAutoDeleteTimerChanged, MessageEntity, PassportData, PhotoSize, Poll,
-    ProximityAlertTriggered, PublicChatChannel, PublicChatSupergroup, Sticker, SuccessfulPayment,
-    True, User, Venue, Video, VideoNote, Voice, VoiceChatEnded, VoiceChatParticipantsInvited,
-    VoiceChatStarted,
+    Animation, Audio, Chat, Contact, Dice, Document, Game, InlineKeyboardMarkup, Invoice, Location,
+    MessageAutoDeleteTimerChanged, MessageEntity, PassportData, PhotoSize, Poll,
+    ProximityAlertTriggered, Sticker, SuccessfulPayment, True, User, Venue, Video, VideoNote,
+    Voice, VoiceChatEnded, VoiceChatParticipantsInvited, VoiceChatStarted,
 };
 
 /// This object represents a message.