chore(cargo): 📦 change license name.

Author: sdttttt

Cargo.toml

@@ -6,7 +6,7 @@ description = "Similar to git-cz, gcr will help you to provide a better Git expe
 readme = "README.md"
 exclude = ["/.github/", "/rustfmt.toml", "/.chglog"]
 edition = "2021"
-license = "UNLICENSED"
+license = "Unlicense"
 repository = "https://github.com/sdttttt/gcr.git"
 keywords = ["git-cz", "git", "cli", "commit"]
 categories = ["command-line-utilities"]