README.md in async_resource_pool-0.1.0 vs README.md in async_resource_pool-0.2.0

- old
+ new

@@ -1,6 +1,7 @@
 # AsyncResourcePool
 
+[![Gem Version](https://badge.fury.io/rb/async_resource_pool.svg)](https://rubygems.org/gems/async_resource_pool)
 [![Build Status](https://travis-ci.com/senid231/async_resource_pool.svg?branch=master)](https://travis-ci.com/senid231/async_resource_pool)
 
 TODO:
 * write description
 * thread safety using Mutex