cron

代码源自robfig/cron，主要是想添加优先级管理。方便项目使用。在Entity中添加优先级字段Priority，并通过channel控制执行顺序

Name		Name	Last commit message	Last commit date
Latest commit History 1 Commit
README.md		README.md
chain.go		chain.go
chain_test.go		chain_test.go
constantdelay.go		constantdelay.go
constantdelay_test.go		constantdelay_test.go
cron.go		cron.go
cron_test.go		cron_test.go
doc.go		doc.go
go.mod		go.mod
logger.go		logger.go
option.go		option.go
option_test.go		option_test.go
parser.go		parser.go
parser_test.go		parser_test.go
spec.go		spec.go
spec_test.go		spec_test.go

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