Remove sdwd crates.

Removes it cuz it doesn't have 2k stars.

README.md

@@ -1311,7 +1311,6 @@ See also [Are we game yet?](https://arewegameyet.rs)
   * [arvancloud/nginx-rs](https://github.com/arvancloud/nginx-rs) — [Nginx](https://www.nginx.com) bindings [![build badge](https://api.travis-ci.org/arvancloud/nginx-rs.svg?branch=master)](https://travis-ci.org/arvancloud/nginx-rs)
   * [hannobraun/inotify-rs](https://github.com/hannobraun/inotify-rs) — [inotify](https://en.wikipedia.org/wiki/Inotify) bindings [![Rust](https://github.com/hannobraun/inotify-rs/actions/workflows/rust.yml/badge.svg)](https://github.com/hannobraun/inotify-rs/actions/workflows/rust.yml)
   * [pop-os/distinst](https://github.com/pop-os/distinst/) — Linux distribution installer
-  * [vityafx/sdwd](https://github.com/vityafx/sdwd) - SystemD WatchDog crate. Provides simple watchdog notification utilities for easy watchdog management.
   * [yaa110/rust-iptables](https://github.com/yaa110/rust-iptables) [[iptables](https://crates.io/crates/iptables)] — [iptables](https://www.netfilter.org/projects/iptables/index.html) bindings [![build badge](https://api.travis-ci.org/yaa110/rust-iptables.svg?branch=master)](https://travis-ci.org/yaa110/rust-iptables)
 * Unix-like
   * [nix-rust/nix](https://github.com/nix-rust/nix) — Unix-like API bindings [![Cirrus Build Status](https://api.cirrus-ci.com/github/nix-rust/nix.svg)](https://cirrus-ci.com/github/nix-rust/nix)