Update README.md

Author: sowderca

README.md

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  [![Build Status](https://travis-ci.org/sowderca/connectwise-ruby-sdk.svg?branch=master)](https://travis-ci.org/sowderca/connectwise-ruby-sdk) 
  [![Dependency Status](https://gemnasium.com/badges/github.com/sowderca/connectwise-ruby-sdk.svg)](https://gemnasium.com/github.com/sowderca/connectwise-ruby-sdk)
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+[![Gem](https://img.shields.io/gem/dt/connectwise-ruby-sdk.svg)](https://rubygems.org/gems/connectwise-ruby-sdk)
 
 connectwise-ruby-sdk - the Ruby gem for the Connectwise REST API