docs: update BACKERS

***NO_CI***

README.md

@@ -162,6 +162,20 @@ Support this project by becoming a sponsor. Your logo will show up in the Contri
       <td align="center" valign="middle" width="192">
         <a href="https://opencollective.com/wikijs/sponsor/11/website" target="_blank"><img src="https://opencollective.com/wikijs/sponsor/11/avatar.svg"></a>
       </td>
+    </tr>
+        <tr>
+      <td align="center" valign="middle" width="192">
+        <a href="https://opencollective.com/wikijs/sponsor/12/website" target="_blank"><img src="https://opencollective.com/wikijs/sponsor/12/avatar.svg"></a>
+      </td>
+      <td align="center" valign="middle" width="192">
+        <a href="https://opencollective.com/wikijs/sponsor/13/website" target="_blank"><img src="https://opencollective.com/wikijs/sponsor/13/avatar.svg"></a>
+      </td>
+      <td align="center" valign="middle" width="192">
+        <a href="https://opencollective.com/wikijs/sponsor/14/website" target="_blank"><img src="https://opencollective.com/wikijs/sponsor/14/avatar.svg"></a>
+      </td>
+      <td align="center" valign="middle" width="192">
+        <a href="https://opencollective.com/wikijs/sponsor/15/website" target="_blank"><img src="https://opencollective.com/wikijs/sponsor/15/avatar.svg"></a>
+      </td>
     </tr>
   </tbody>
 </table>