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Addresses https://github.com/ondrejbartas/sidekiq-cron/issues/199

Sidekiq-cron is not using rufus-scheduler itself but rather its cron logic which recently got spun off in the fugit gem (https://github.com/floraison/fugit).

This patch makes Sidekiq-cron depend directly on fugit instead of rufus-scheduler.

A refinement would be to cache the parsed cron line in the Sidekiq-cron Job instance so that there is no need to reparse each time.