Remove lock from rust gitignore

As per updated guidelines, the lockfile should be committed by default.

https://doc.rust-lang.org/cargo/faq.html#why-have-cargolock-in-version-control

Rust.gitignore

@@ -3,10 +3,6 @@
 debug/
 target/
 
-# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
-# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
-Cargo.lock
-
 # These are backup files generated by rustfmt
 **/*.rs.bk