Fix lint errors

.eslintrc.json

@@ -131,6 +131,7 @@
     "AccountSettings": true,
     "Announcements": true,
     "Swimlanes": true,
+    "ChecklistItems": true,
     "Npm": true
   }
 }

models/checklistItems.js

@@ -56,7 +56,7 @@ ChecklistItems.mutations({
     };
 
     return {$set: mutatedFields};
-  }
+  },
 });
 
 // Activities helper