Fix typo version in documentation page

Author: danielcaldas

docs/index.html

@@ -25,7 +25,7 @@
       <div id='split-left' class='overflow-auto fs0 height-viewport-100'>
         <div class='py1 px2'>
           <h3 class='mb0 no-anchor'>react-d3-graph</h3>
-          <div class='mb1'><code>2.2.0</code></div>
+          <div class='mb1'><code>2.3.0</code></div>
           <h3>Quick Links</h3>
           <h4><a href="https://github.com/danielcaldas/react-d3-graph" target="_blank">🔗 GitHub Repo</a></h4>
           <h4><a href="https://danielcaldas.github.io/react-d3-graph/sandbox/index.html" target="_blank">🔗 Live Demo</a></h4>