Change #267: Update dependencies and require Go 1.18 or newer
Most dependencies have been updated. Since some libraries require newer language
features, support for Go 1.17 has been dropped, which means that rest-server now
requires at least Go 1.18 to build.
Enhancement #271: Print listening address after start-up
When started with --listen :0, rest-server would print start server on :0
The message now also includes the actual address listened on, for example start server on 0.0.0.0:37333. This is useful when starting a server with an
auto-allocated free port number (port 0).
Enhancement #272: Support listening on a unix socket
It is now possible to make rest-server listen on a unix socket by prefixing the
socket filename with unix: and passing it to the --listen option, for
example --listen unix:/tmp/foo.
This is useful in combination with remote port forwarding to enable a remote
server to backup locally, e.g.:
