:beetle: `MapDClient.prototype.recv_disconnect` returns undefined but `MapDClient.prototype.send_disconnect` expects it to be defined. <img width="613" alt="screen shot 2018-07-23 at 15 58 09" src="https://user-images.githubusercontent.com/589034/43107301-39ef7c6e-8e91-11e8-8bdd-b10fdc2ecf32.png">