add goreleaser workflow

Handle SIGINT/SIGTERM to allow graceful shutdown (#28)

Update README to include info about background mode

hold: add --stop option to stop the breakpoint server after holding (#25)

cmd/breakpoint: Add hold command to wait until there are no connections (#24)

Add support for windows shell and command wrapping

goreleaser: added windows build. (#22)

first windows port; no pty support. (#21)

cmd/breakpoint: Add number of active connections to breakpoint status (#20)

cmd/breakpoint: add --duration as alias of --for to extend command (#19)

cmd/breakpoint: Add start command that starts breakpoint in the background (#18)

nochangelog: Extract config parsing into pkg/config (#17)

Modify output "connect with" to be more copy-pastable.

cmd/breakpoint: Use user preferred shell if set.

GitHub: don't fail if a user has no SSH keys. (#13)