add chia7712 to PMC (#336)

Reviewers: Mickael Maison <mickael.maison@gmail.com>
diff --git a/committers.html b/committers.html
index 48259b0..6345060 100644
--- a/committers.html
+++ b/committers.html
@@ -331,7 +331,7 @@
         </td>
         <td>
           Chia-Ping Tsai<br>
-          Committer<br>
+          Committer, and PMC member<br>
           <a href="https://www.linkedin.com/in/chia7712/">/in/chia7712</a><br>
         </td>
       </tr>