docs: Update project URL and add security policy

- Update the URL in `Cargo.toml` to point to
  `GitoxideLabs/cargo-smart-release` since the repo was moved
  (though the old URL will still work as a redirect).

- Add a `SECURITY.md` file with the same wording as in `gitoxide`,
  but where the hyperlink is for drafting a `cargo-smart-release`
  advisory (rather than a `gitoxide` advisory).

Author: EliahKagan

Cargo.toml

@@ -2,7 +2,7 @@
 name = "cargo-smart-release"
 version = "0.21.6"
 authors = ["Sebastian Thiel <[email protected]>"]
-repository = "https://github.com/Byron/cargo-smart-release"
+repository = "https://github.com/GitoxideLabs/cargo-smart-release"
 description = "Cargo subcommand for fearlessly releasing crates in workspaces."
 license = "MIT OR Apache-2.0"
 edition = "2021"

SECURITY.md

@@ -0,0 +1,9 @@
+# Security Policy
+
+## Reporting a Vulnerability
+
+Please feel free to [draft a GitHub advisory](https://github.com/GitoxideLabs/cargo-smart-release/security/advisories/new), and I will work with you to disclose and or resolve the issue responsibly.
+
+If this doesn't seem like the right approach or there are questions, please feel free to reach out to the email used in Sebastian Thiel's commits.
+
+Thank you.