Mark NFC as a proposal

Author: CrazyPython

index.html

@@ -471,9 +471,9 @@ <h3>Key</h3>
                     <dt>Bt</dt>
                     <dd>Web Bluetooth</dd>
                 </td>
-                <td class=none>
+                <td class=proposal>
                     <time><a href="https://w3c.github.io/web-nfc/">2020</a></time>
-                    </dt>Nfc</dt>
+                    <dt>Nfc</dt>
                     <dd>Web NFC</dd>
                 </td>
             </tr>