Use latest version in demo page

Author: ukupat

index.html

@@ -106,7 +106,7 @@ <h1>SQL Formatter</h1>
         </section>
     </main>
 
-    <script type="text/javascript" src="https://unpkg.com/sql-formatter@1.1.2/dist/sql-formatter.min.js"></script>
+    <script type="text/javascript" src="https://unpkg.com/sql-formatter@latest/dist/sql-formatter.min.js"></script>
     <script>
         (function() {
             let language = document.getElementById('language');