title: Generating a random number in a custom range
body: <p>I have go script that starts on "localhost:8080/1" with a  <strong>previous</strong> and <strong>next</strong> links I need to add <strong>Random</strong> link  with custom range that I can change like:</p>
  
  <ul>
  <li>small numbers like 100 to 200 "localhost:8080/100 - 200" and </li>
  <li>even to big number like: "16567684686592643791596485465456223131545455682945955"</li>
  </ul>
  
  <p>So:</p>
  
  <pre><code>// Get next and previous page numbers
  
  previous := new(big.Int).Sub(page, one)
  next := new(big.Int).Add(page, one)
  random :=????
  </code></pre>