chore: update Cargo.toml to 0.2.1

Author: bashandbone

Cargo.toml

@@ -4,7 +4,7 @@
 
 [package]
 name = "submod"
-version = "0.2.0"
+version = "0.2.1"
 edition = "2024"
 rust-version = "1.87"
 description = "A headache-free submodule management tool, built on top of gitoxide. Manage sparse checkouts, submodule updates, and adding/removing submodules with ease."