Also ran gofmt on everything. Thanks again @paralin. #334

Co-authored-by: Christian Stewart <christian@paral.in>

Closes #248

Luckily, due to the 5s timeout on the close handshake, this would have
had very minimal effects on anyone in production.

Closes #220 and #230

Closes #231

Closes #215

Closes #213

Will prevent deadlock if a writer is used after close.

Closes #191

Much simpler config. Github Actions just isn't there yet.

See https://github.com/nhooyr/websocket/issues/182

Was noop before.

Closes #182

Too many improvements and changes to list.

Will include a detailed changelog for release.