Add release badge

README.md

diff --git a/README.md b/README.md
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 # bats-support
 
 [![GitHub license](https://img.shields.io/badge/license-CC0-blue.svg)](https://raw.githubusercontent.com/ztombol/bats-support/master/LICENSE)
+[![GitHub release](https://img.shields.io/github/release/ztombol/bats-support.svg)](https://github.com/ztombol/bats-support/releases/latest)
 [![Build Status](https://travis-ci.org/ztombol/bats-support.svg?branch=master)](https://travis-ci.org/ztombol/bats-support)
 
 `bats-support` is a supporting library providing common functions to