0.21.1

Additions:

• Add send ACK timeout mechanism
  • Increase UDP_SEND_ACK_TIMEOUT to 2 seconds

Bug fixes:

• Guard against protocol is None in connect function
• Check for connection closures while waiting on mutex in _write function

Optimizations:

• Move bytes and json decoding from server to webhook_push_callback

Full Changelog: 0.21.0...0.21.1