DEL: Cargo.lock for library crates.

Author: Kris van Rens

.gitignore

@@ -3,6 +3,10 @@
 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