Closes #111
Closes #112

Ignore write error when echoing close frame

Closes #109

Switch to CircleCI

Closes #107

Update Conn.Close docs

Closes #103

See https://github.com/nhooyr/websocket/issues/100#issuecomment-508148024

Add NetConn adapter and protect against Reader after CloseRead

Closes #101

Closes #100

Add CloseRead and closeError test

Closes #98

Both Reader and Writer now will only ever allocate 16 bytes
for their entire usage :)

This is the minimum possible while still preventing misuse
of a EOFed Reader or a closed Writer.

Remove readLoop