Updated used cron library to version 3 #4
Merged
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Hey,
I noticed that the used cron library robfig/cron is at version 3 by now whereas the current version of the module uses a much older version. Version 3 of this library aligns more with the standard notion of defining cron schedules, i.e. omits seconds.
For downwards-compatibility, I added a default schedule parser that accepts standard cron schedules with optional seconds. A future PR could contain changes to the functions in a form that they accept options so that the caller can explicity state the format of their cron schedule.