2.0.0 / 2020-05-11
=================
  * use es6
  
1.0.7 / 2017-01-20
=================
  * [NEW] use mqtt-mailbox, mqtt-acceptor

1.0.6 / 2017-01-19
=================
  * [NEW] use pure javascript implemented mqtt protocol
  * [NEW] improved performance
  * [NEW] better benchmark samples
  
2.0.0 / 2020-05-24
=================
  * use es6
  
2.0.1 / 2020-08-15
=================
  * default socket.io