fix: include author and version in clap

Cargo.toml

@@ -1,6 +1,7 @@
 [package]
 name = "git-vain"
 version = "0.1.0"
+authors = ["Anna <git-vain@anna.lgbt>"]
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

src/main.rs

@@ -41,6 +41,7 @@ use sha1::{Digest, Sha1};
 /// Providing a key file is orders of magnitude faster than providing a key ID,
 /// since using a key ID goes through gpg-agent, which is very slow.
 #[derive(Parser)]
+#[command(author, version)]
 struct Cli {
     /// The commit to replace with a vanity hash.
     #[arg(short, long, default_value_t = String::from("HEAD"))]