Add Annabelle as editorial assistant

Author: annabelles3

_pages/about.md

@@ -42,6 +42,10 @@ Submissions should not currently be under consideration by or already published
 
 [Greta Swain](http://gretaswain.org/), Southern Methodist University
 
+### Editorial Assistants
+
+[Annabelle Spencer](http://annabellespencer.org), George Mason University
+
 ### Editorial Board
 
 [Cameron Blevins](http://www.cameronblevins.org), University of Colorado, Denver