v1.2.3-alpha.1

Development build

• Supported receiving and approving group invite/request join messages
• Supported receiving and approving friend request messages
• Use generated code to improve the runtime performance of decoding protobuf.
• Fix parse xml chance to fail (#141)

New events

• OnGroupInvite
• OnGroupRequestJoin
• OnFriendRequest

In this version, you can easily handle the event without cast object sender to Bot.
for example:

// the legacy style
_bot.OnGroupMessage += (s, e) => {
  var bot = (Bot)s;
  bot.SendGroupMessage(e.GroupUin, "example");
}

// now you can use this as simplified
_bot.OnGroupMessage += (bot, e) 
  => bot.SendGroupMessage(e.GroupUin, "example");