Update John's profile (#288)

Reviewers: Guozhang Wang <wangguoz@gmail.com>
diff --git a/committers.html b/committers.html
index 2a967b4..162b891 100644
--- a/committers.html
+++ b/committers.html
@@ -285,7 +285,7 @@
         </td>
         <td>
           John Roesler<br>
-          Committer<br>
+          Committer, and PMC member<br>
           <a href="https://www.linkedin.com/in/john-roesler-6280755/">/in/john-roesler-6280755</a><br>
         </td>
         <td>