Fix indetation

Author: jakezatecky

examples/src/index.html

@@ -41,7 +41,7 @@ <h2>Large Data Example</h2>
           <a href="https://github.com/jakezatecky/react-checkbox-tree">React Checkbox Tree</a> is maintained by <a href="https://github.com/jakezatecky">jakezatecky</a>.
         </span>
         <span class="site-footer-credits">
-        This page is hosted by <a href="https://pages.github.com">GitHub Pages</a>.
+          This page is hosted by <a href="https://pages.github.com">GitHub Pages</a>.
         </span>
       </footer>
     </section>