readme: Update version badge to latest release

Author: Jason Phan

README.md

@@ -4,7 +4,7 @@
   <img alt="Getty" src="https://github.com/getty-zig/logo/blob/main/getty-solid.svg" width="410px">
   <br/>
   <br/>
-  <a href="https://github.com/getty-zig/getty/releases/latest"><img alt="Version" src="https://img.shields.io/badge/version-N/A-e2725b.svg?style=flat-square"></a>
+  <a href="https://github.com/getty-zig/getty/releases/latest"><img alt="Version" src="https://img.shields.io/github/v/release/getty-zig/getty?include_prereleases&label=version&style=flat-square"></a>
   <a href="https://github.com/getty-zig/getty/actions/workflows/ci.yml"><img alt="Build status" src="https://img.shields.io/github/workflow/status/getty-zig/getty/ci?style=flat-square" /></a>
   <a href="https://ziglang.org/download"><img alt="Zig" src="https://img.shields.io/badge/zig-master-fd9930.svg?style=flat-square"></a>
   <a href="https://github.com/getty-zig/getty/blob/main/LICENSE"><img alt="License" src="https://img.shields.io/badge/license-MIT-blue?style=flat-square"></a>