v0.6.0

• Factor clock logic out of main.rs
• Instead of hardcoding sign address, require -a or --address command line option to specify it
• Add -d or --dayofweek flag to show the day of the week (e.g. WED 28) after the time instead of the month (FEB 28)
• Add -o or --oneshot option to display the time once and exit, suitable for use in a cron job

Full Changelog: v0.5.0...v0.6.0