title: Round a ruby float up or down to the nearest 0.05
body: <p>I'm getting numbers like </p>
  
  <pre><code>2.36363636363636
  4.567563
  1.234566465448465
  10.5857447736
  </code></pre>
  
  <p>How would I get Ruby to round these numbers up (or down) to the nearest 0.05?</p>