add playtesters to credits

intro.tex

@@ -43,7 +43,9 @@ Neil McDonnell for the basic photograph which became the Polymorph image,
 ).
 Find him at artstation.com/hertz.
 
-\subsection*{and to the playtesters} Marri Russell, Ross Oliver, Reiss McGee, David Smith, Michael Dyson, Ryan Trotter, Maggie Anderson, Aleksej, Mihailo, and Proxy; also thanks to Ari-Matti Piippo for his insightful comments.
+\subsection*{and to the playtesters} Marri Russell, Ross Oliver, Reiss McGee, David Smith, Michael Dyson, Ryan Trotter, Maggie Anderson, 
+D\'{o}nal Emerson, Christopher Taylor, June Strang, 
+Aleksej, Mihailo, and Proxy; also thanks to Ari-Matti Piippo for his insightful comments.
 
 \end{multicols}