add aweseome badge

README.md

@@ -3,6 +3,7 @@
   <a href="https://goreportcard.com/badge/github.com/rogerwelin/cassowary"><img src="https://goreportcard.com/badge/github.com/rogerwelin/cassowary" alt="Go Report Card"></a>
   <a href="https://travis-ci.org/rogerwelin/cassowary"><img src="https://travis-ci.org/rogerwelin/cassowary.svg?branch=master" alt="Build status"></a>
   <a href="https://github.com/rogerwelin/cassowary/blob/master/LICENSE"><img src="https://img.shields.io/github/license/rogerwelin/cassowary" alt="License"></a>
+  <a href="https://github.com/avelino/awesome-go"><img src="https://awesome.re/mentioned-badge.svg" alt="Mentioned in Awesome Go"></a>
   <a href="https://github.com/rogerwelin/cassowary/blob/master/go.mod"><img src="https://img.shields.io/github/go-mod/go-version/rogerwelin/cassowary" alt="Go version"></a>
   <a href="https://github.com/rogerwelin/cassowary/releases"><img src="https://img.shields.io/github/v/release/rogerwelin/cassowary.svg" alt="Current Release"></a>
   <a href="https://godoc.org/github.com/rogerwelin/cassowary"><img src="https://godoc.org/github.com/rogerwelin/cassowary?status.svg" alt="godoc"></a>