Add David Arthur's PMC status in committers.html
diff --git a/committers.html b/committers.html
index 6f523ec..4a670e8 100644
--- a/committers.html
+++ b/committers.html
@@ -80,7 +80,7 @@
         </td>
         <td>
     	  David Arthur<br>
-    	  Committer<br>
+    	  Committer, and PMC member<br>
     	  <a href="https://www.linkedin.com/in/davidrarthur">/in/davidarthur</a><br>
     	  <a href="https://github.com/mumrah">github.com/mumrah</a>
         </td>