use latest version in examples file

Author: keithamus

examples/index.html

@@ -186,7 +186,7 @@ <h2>Localised Dates</h2>
   </p>
 
   <!-- <script type="module" src="../dist/index.js"></script> -->
-  <script type="module" src="https://unpkg.com/@github/relative-time-element@4.1.2/dist/bundle.js"></script>
+  <script type="module" src="https://unpkg.com/@github/relative-time-element@latest/dist/bundle.js"></script>
   <script>
     document.body.addEventListener('relative-time-updated', event => {
       console.log('event from', event.target, event)