Considering add a server version indication as connection parameter in obfs4

Currently, we are encountering the issue that obfs4 servers are not updating to the most recent version which are creating connection stability issues during handshake phase.

We already propose an amendment However, it will take a while to get it accepted and working.

One of the way we could fix this right now, is add a new connection parameter to indicate protocol version. This will allow client to connect to server in a way server can understand.