show open host and port for incoming in beet.

[oxarbitrage]

Is your feature request related to a problem? Please describe.
First time users like me will not know what is the host and port(ws://localhost:60555) beet is opening for incoming connections from a website.

Describe the solution you'd like
We should mention this default host in the README and if possible show somewhere in the application. Console message at least will be good.

Describe alternatives you've considered
I got the port beet was opening by using netstat but that is time consuming.