Ignore `Cargo.lock` in Git
Ignore `Cargo.lock` in Git

This is a library project and should not check in its `Cargo.lock`.
Being in the `.gitignore` file helps achieve that.

http://doc.crates.io/faq.html#why-do-binaries-have-cargolock-in-version-control-but-not-libraries

tbu-/arrayvec,bluss/arrayvec