This repo seems to be no longer available at philnash/crotp.
Git synchronization failed about 14 hours ago. Last successful sync was 1 day ago.
crotp: github: philnash/crotp version: ~> 1.0.0
{'branch' => 'crystal-version', 'github' => 'philnash/base32'}
{'github' => 'crystal-ameba/ameba', 'version' => '~> 0.13.4'}