fix: Include due date when importing from Trello

Closes #598

server/api/helpers/boards/import-from-trello.js

@@ -107,6 +107,7 @@ module.exports = {
             position: trelloCard.pos,
             name: trelloCard.name,
             description: trelloCard.desc || null,
+            dueDate: trelloCard.due,
           }).fetch();
 
           await importCardLabels(plankaCard, trelloCard);