v3.21.0

• Create BulkSalesOrder.php #383 by @fairweb-idejong
• Add missing properties to SalesEntryLine #380 by @jorisvaesen
• Add Discount property #382 by @wulsic
• Move the access token payload builder below the access token lock callback #381 by @mbardelmeijer
• Update Item.php #376 (added Net Weight) by @fairweb-idejong
• Add Warehouse property #375 by @Soneritics