Use Oxford comma if more than two members in the group.

Author: gkellogg

participants.html

@@ -1 +1 @@
-Members of the RDF-star Working Group Group included Adrian Gschwend, Andy Seaborne, Antoine Zimmermann, Dan Brickley, David Chaves-Fraga, Dominik Tomaszuk, Dörthe Arndt, Enrico Franconi, Fabien Gandon, Gregg Kellogg, Gregory Williams, Jesse Wright, Julián Arenas-Guerrero, Olaf Hartig, Ora Lassila, Pasquale Lisena, Peter Patel-Schneider, Pierre-Antoine Champin, Raphaël Troncy, Ruben Taelman, Rémi Ceres, Sarven Capadisli, Souripriya Das, Ted Thibodeau and Timothée HAUDEBOURG.
+Members of the RDF-star Working Group Group included Adrian Gschwend, Andy Seaborne, Antoine Zimmermann, Dan Brickley, David Chaves-Fraga, Dominik Tomaszuk, Dörthe Arndt, Enrico Franconi, Fabien Gandon, Gregg Kellogg, Gregory Williams, Jesse Wright, Julián Arenas-Guerrero, Olaf Hartig, Ora Lassila, Pasquale Lisena, Peter Patel-Schneider, Pierre-Antoine Champin, Raphaël Troncy, Ruben Taelman, Rémi Ceres, Sarven Capadisli, Souripriya Das, Ted Thibodeau, and Timothée HAUDEBOURG.

participants.js

@@ -57,9 +57,12 @@ https.get(groupOptions, (res) => {
 
         if (sortedUsers.length === 1) {
           console.log(`The sole member of the ${groupName} Group was ${sortedUsers[0]}.`);
-        } else if (sortedUsers.length > 1) {
+        } else if (sortedUsers.length === 2) {
+          const joinedUsers = sortedUsers.join(' and ');
+          console.log(`Members of the ${groupName} Group included ${joinedUsers}.`);
+        } else {
           const joinedUsers = sortedUsers.slice(0, -1).join(', ');
-          console.log(`Members of the ${groupName} Group included ${joinedUsers} and ${sortedUsers[sortedUsers.length - 1]}.`);
+          console.log(`Members of the ${groupName} Group included ${joinedUsers}, and ${sortedUsers[sortedUsers.length - 1]}.`);
         }
       });
     }).on('error', (err) => {