Croniter

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- DOW occurrence sharp style support.
[kiorky, Kengo Seki <sekiknapache.org>]

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- Better test suite [mrcrillygithub]
- DST support [kiorky]

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- fix bug around multiple conditions and range_val in
_get_prev_nearest_diff.
[abeja-yukigithub]

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- issue 69: added day_or option to change behavior when day-of-month and
day-of-week is given
[Andreas Vogl <a.voglhackner-security.com>]

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- `Real fix for 34 <https://github.com/taichino/croniter/pull/73>`_
[kiorkygithub]
- `Modernize test infra <https://github.com/taichino/croniter/pull/72>`_
[kiorkygithub]
- `Release as a universal wheel <https://github.com/kiorky/croniter/pull/16>`_
[adamchainzgithub]
- `Raise ValueError on negative numbers <https://github.com/taichino/croniter/pull/63>`_
[josegonzalezgithub]
- `Compare types using "issubclass" instead of exact match <https://github.com/taichino/croniter/pull/70>`_
[darkkgithub]
- `Implement step cron with a variable base <https://github.com/taichino/croniter/pull/60>`_
[josegonzalezgithub]

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- support setting ret_type in __init__ [Brent Tubbs <brent.tubbsgmail.com>]