change version in UI

Author: mmajis

ui/index.html

@@ -2012,7 +2012,7 @@
           </div>
           <div class="footer-copyright">
             <div class="container">
-            <a href="https://github.com/mmajis/plantuml-serverless">PlantUML Serverless</a> v0.1.1 is licensed under <a href="https://www.gnu.org/licenses/gpl-3.0.en.html">GPLv3</a> and is powered by <a href="https://www.plantuml.com">PlantUML</a>. UI Based on work by <a href="https://https://github.com/sujoyu/plantuml-previewer">sujoyu</a>.
+            <a href="https://github.com/mmajis/plantuml-serverless">PlantUML Serverless</a> v0.3.1 is licensed under <a href="https://www.gnu.org/licenses/gpl-3.0.en.html">GPLv3</a> and is powered by <a href="https://www.plantuml.com">PlantUML</a>. UI Based on work by <a href="https://https://github.com/sujoyu/plantuml-previewer">sujoyu</a>.
             </div>
           </div>
         </footer>