Add Tim Downey to git-authors

Author: tcdowney

assets/git-authors

@@ -8,5 +8,6 @@ authors:
   dfo: Daniel Felipe Ochoa; daniel.ochoa
   mp: Marc Paquette; marc.paquette 
   ad: Amelia Downs; amelia.downs 
+  td: Tim Downey; tim.downey
 email:
   domain: broadcom.com