Reduce LARGE CPU consumption by using min-heap instead of sorting all entries every time

[tovenja]

You can also use the fork version，https://github.com/tovenja/cron

all test cases PASS

[zeewell]

Good Job! But, maybe you should keep the module name.

[janrnc]

Hi @tovenja, we're working on a fork of this project and we'd like to have your contribution to it. This Min Heap structure is reasonable, would you be interested in opening a PR there?