Add GH downloads badge.

Author: thedodd

README.md

@@ -2,9 +2,10 @@
 <div align="center">
 
 [![Build Status](https://github.com/thedodd/trunk/workflows/ci/badge.svg?branch=master)](https://github.com/thedodd/trunk/actions)
-[![Crates.io](https://img.shields.io/crates/v/trunk.svg)](https://crates.io/crates/trunk)
-[![License](https://img.shields.io/badge/license-MIT%2FApache--2.0-blue)](LICENSE)
-![Crates.io](https://img.shields.io/crates/d/trunk.svg)
+[![](https://img.shields.io/crates/v/trunk.svg?style=flat-square)](https://crates.io/crates/trunk)
+![](https://img.shields.io/badge/license-MIT%2FApache--2.0-blue?style=flat-square)
+![](https://img.shields.io/crates/d/trunk?label=downloads%20%28crates.io%29&style=flat-square)
+![](https://img.shields.io/github/downloads/thedodd/trunk/total?label=downloads%20%28GH%29&style=flat-square)
 
   <strong>
     Build, bundle & ship your Rust WASM application to the web.