Cargo Features

[dependencies]
cron_tab = { version = "0.2.5", default-features = false, features = ["all", "sync", "async"] }
default = sync

The sync feature is set by default whenever cron_tab is added without default-features = false somewhere in the dependency tree.

all = async, sync
sync default all?
async all?

Enables futures and tokio

CronTab has 4 features without comments.