title: Should an ampersand be URL encoded in a query string?
body: <p>For example I quite often see this URL come up.</p>
  
  <pre><code>https://ghbtns.com/github-btn.html?user=example&amp;repo=card&amp;type=watch&amp;count=true
  </code></pre>
  
  <p>Is the <code>&amp;</code> meant to be <code>&amp;amp;</code> or should/can it be left as <code>&amp;</code>?</p>