Update footer emojy by a purple one

Author: wlsf82

src/index.html

@@ -428,7 +428,7 @@ <h2>
         </div>
       </main>
     <footer>
-      <p>This app was made with a lot of 💚 by <a href="https://walmyr.dev" target="_blank">Walmyr</a>.</p>
+      <p>This app was made with a lot of 💜 by <a href="https://walmyr.dev" target="_blank">Walmyr</a>.</p>
     </footer>
     <script src="script.js"></script>
   </body>