Croniter

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- Nothing changed yet.

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- No changes, fix lint [kiorky]

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- Support hashid strings in is_valid [george-kuanli-peng, kiorky]
- Avoid over-optimization in crontab expansions [Cherie0125, liqirui <liqiruibaidu.com>, kiorky]

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- Add match_range function [salitaba]

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- fix leap year (29 days in February) [zed2015]

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- Fix release issue [kiorky]