title: Prawn requires ruby version 1.9.3
body: <p>I have <strong>ruby version 1.9.2p290</strong> installed and <strong>prawn 0.13.0</strong> in my <strong>2</strong> laptops.
  When I tried to install the prawn on laptop A, it was successful and I'm able to use it but when I tried it to laptop B, it prompted an error that it requires ruby -v 1.9.3</p>
  
  <p><img src="https://i.stack.imgur.com/fw1AN.png" alt="enter image description here"></p>
  
  <p>How will I be able to solve this issue without changing the ruby version? Thanks in advance.</p>