Common ChatMember fields

[nothingelsematters]

• Bug: 2 forgotten Serializable
• Feature: common ChatMember fields, I had to write the following code:

val user = when (chatMember) {
    is ChatMember.Owner -> chatMember.user
    is ChatMember.Member -> chatMember.user
    is ChatMember.Left -> chatMember.user
    is ChatMember.Banned -> chatMember.user
    is ChatMember.Restricted -> chatMember.user
    is ChatMember.Administrator -> chatMember.user
}