Add Cargo.lock to the git repository

It is recommended[1] for binary crates to include Cargo.lock files in
their respective git repositories.

[1]: https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html

Author: Detegr

.gitignore

@@ -1,4 +1,3 @@
 /target
 **/*.rs.bk
-Cargo.lock
 /release