Update version information in index.html

Added app version display in the about section.

Author: WorkofAditya

index.html

@@ -90,7 +90,9 @@ <h2 class="about-title">ChatBot</h2>
     </div>
 
     <p class="about-dev">Developed by <b>Adityasinh Sodha</b></p>
-        <p class="about-version">Version: <b>v2.0.1</b></p>
+        <p class="about-version">Version: <b>v2.0.1</b><br><tr>
+        App version: <b id="appVersion">Loading...</b></tr>
+        </p>
   </div>
 </div>