message: remove Cargo.lock from the list of ignored files
diff: /target/
  /tests/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
  