Add TimescaleDB sponsorship

* Add Sponsors to BACKERS.md

BACKERS.md

@@ -2,6 +2,30 @@
 
 PostgREST ongoing development is only possible thanks to our Sponsors and Backers, listed below. If you'd like to join them, you can do so by supporting the PostgREST organization on [Patreon](https://www.patreon.com/postgrest).
 
+## Sponsors
+
+<table>
+  <tbody>
+    <tr>
+      <td align="center" valign="middle">
+        <a href="https://tryretool.com/?utm_source=sponsor&utm_campaign=postgrest" target="_blank">
+          <img width="222px" src="static/retool.png">
+        </a>
+      </td>
+      <td align="center" valign="middle">
+        <a href="https://www.timescale.com?utm_campaign=postgrest&utm_source=sponsor&utm_medium=referral&utm_content=github" target="_blank">
+          <img width="222px" src="static/timescaledb.png">
+        </a>
+      </td>
+      <td align="center" valign="middle">
+        <a href="https://patreon.com/postgrest" target="_blank">
+          <img width="222px" src="static/become_sponsor.svg">
+        </a>
+      </td>
+    </tr>
+  </tbody>
+</table>
+
 ## Lead Backers
 
 - [Daniel Babiak](https://github.com/d-babiak)

README.md

@@ -25,9 +25,14 @@ API than you are likely to write from scratch.
           <img width="222px" src="static/retool.png">
         </a>
       </td>
+      <td align="center" valign="middle">
+        <a href="https://www.timescale.com?utm_campaign=postgrest&utm_source=sponsor&utm_medium=referral&utm_content=github" target="_blank">
+          <img width="222px" src="static/timescaledb.png">
+        </a>
+      </td>
       <td align="center" valign="middle">
         <a href="https://patreon.com/postgrest" target="_blank">
-          <img width="222px" src="https://opencollective.com/static/images/become_sponsor.svg">
+          <img width="222px" src="static/become_sponsor.svg">
         </a>
       </td>
     </tr>