title: Github contributions graph
body: <p>There is a wonderful contributions chart that github.com came with.</p>
  
  <p><img src="https://i.stack.imgur.com/43Wc0.png" alt="enter image description here"></p>
  
  <p>Does anybody know if they use some kind of library or gem? </p>
  
  <p>If it is open source, I would like to use it my project as well. It looks great!</p>