fixed race condition: https://github.com/cyclone-github/argon_cracker/issues/5
fixed close on closed channel: https://github.com/cyclone-github/argon_cracker/issues/6
- fixed https://github.com/cyclone-github/argon_cracker/issues/2
- added -t flag to allow user to specify CPU threads
- added hash sanity checks
- cleaned up & refactored code
- initial github release