ucache(util of go cache)

NewSetExpired 创建带有过期时间的集合(类似与Python Set)

Name		Name	Last commit message	Last commit date
Latest commit History 1 Commit
.gitignore		.gitignore
README.md		README.md
go.mod		go.mod
ucache.go		ucache.go
ucache_test.go		ucache_test.go