rustc_tool_utils: expand Cargo.toml with a few keywords in preparation for crates.io release

Author: matthiaskrgr

rustc_tools_util/Cargo.toml

@@ -2,5 +2,11 @@
 name = "rustc_tools_util"
 version = "0.1.0"
 authors = ["Matthias Krüger <[email protected]>"]
+description = "small helper to generate version information for git packages"
+repository = "https://github.com/rust-lang/rust-clippy"
+readme = "README.md"
+license = "MIT/Apache-2.0"
+keywords = ["rustc", "tool", "git", "version", "hash"]
+categories = ["development-tools"]
 edition = "2018"
 [dependencies]