chrono: update to 0.4
The chrono 0.3.1 release was yanked from crates.io due to breaking semantic versioning (chrono issue 156). Now chrono 0.4 has been released to support serde 1.0.
The chrono 0.3.1 release was yanked from crates.io due to breaking semantic versioning (chrono issue 156). Now chrono 0.4 has been released to support serde 1.0.