Update editorial_board.md

Adding Laura to the list of former members of the editorial board.

pages/about/editorial_board.md

@@ -52,6 +52,6 @@ Please send your application to [email protected].
 
 ## Past editorial board members
 
-In this section we would like to thank contributions of our past editorial members.
+In this section, we would like to thank the contributions of our past editorial members.
 
-{% include contributor-tiles-all.html custom="Mijke Jetten, Niclas Jareborg, Pinar Alper, Rob Hooft, Daniel Faria, Martin Cook" %}
+{% include contributor-tiles-all.html custom="Mijke Jetten, Niclas Jareborg, Pinar Alper, Rob Hooft, Daniel Faria, Martin Cook, Laura Portell Silva" %}