Update Solidity EIP-663 readiness

Author: gumb0

index.html

@@ -273,7 +273,7 @@ <h2>Implementations</h2>
 <td>👍</td>
 <td>👍</td>
 <td>👍</td>
-<td></td>
+<td>👍</td>
 </tr>
 <tr>
 <td><a href="https://github.com/vyperlang/vyper/pull/3457">vyper</a></td>