Update index.html - 6.3 release

Author: sharadraju

index.html

@@ -22,7 +22,7 @@
         <img class="headerLogo" alt="node-oracledb logo" src="logo.png" />
       </div>
       <div class="headerContent">
-        <h1 class="headerTitle">Node.js node-oracledb version 6.2</h1>
+        <h1 class="headerTitle">Node.js node-oracledb version 6.3</h1>
         <nav class="headerNav" role="navigation">
           <ul>
             <li><a href="https://node-oracledb.readthedocs.io/en/latest/">Documentation</a></li>