Added Discord link in footer

Author: shellyverma

src/components/Footer/Footer.jsx

@@ -42,6 +42,9 @@ const Footer = () => (
         <Link className="footer__link" to="https://gitter.im/webpack/webpack">
           Gitter
         </Link>
+        <Link className="footer__link" to="https://discord.com/invite/8WWf6F7p">
+          Discord
+        </Link>
         <Link
           className="footer__link"
           to="https://github.com/webpack/webpack/releases"