main: Replace `sleep` call with a `wait-group`

The `sleep` call allowed me to test the behaviour of the program, since
without it, it would exit before the WebSocket messages had a chance to
be sent and received.

But we shouldn't be waiting a fixed number of seconds for the program to
execute. Instead, we should only keep the program alive as long as there
are messages to be sent and received.

This adds a Go-style wait group using my wait-group library that
increments the wait group when we send a WebSocket message, and
decrements it when we receive a WebSocket response. That allows us to
keep the program alive only for the amount of time necessary for the
messages to be exchanged.

0 files changed, 0 insertions, 0 deletions