Chat() *Chat logic expanded

myChatMember and chatMember cases were added

admin.go

@@ -37,10 +37,10 @@ func (c *ChatInviteLink) ExpireDate() time.Time {
 // ChatMemberUpdated object represents changes in the status of a chat member.
 type ChatMemberUpdated struct {
 	// Chat where the user belongs to.
-	Chat Chat `json:"chat"`
+	Chat *Chat `json:"chat"`
 
 	// From which user the action was triggered.
-	From User `json:"from"`
+	From *User `json:"from"`
 
 	// Unixtime, use ChatMemberUpdated.Time() to get time.Time
 	Unixtime int64 `json:"date"`

context.go

@@ -240,6 +240,10 @@ func (c *nativeContext) Chat() *Chat {
 		return c.message.Chat
 	case c.callback != nil && c.callback.Message != nil:
 		return c.callback.Message.Chat
+	case c.myChatMember != nil:
+		return c.myChatMember.Chat
+	case c.chatMember != nil:
+		return c.chatMember.Chat
 	default:
 		return nil
 	}