Slightly easier to reason about the code via some code movement, printing some
banners to make it more obvious when cargo is being run since it is run so many
times.
This adds a new `std` feature to chrono that is enabled by default. By
deactivating this feature via `default-features = false` you can now use
chrono in applications that don't use the standard library. The `serde`
feature is supported as well.
Resolves#336
And fail CI in the future if `make readme` isn't run when it is needed.
CC conversation in #185, where the README didn't get updated for a year after
lib.rs was improved.
