Merge pull request #1664 from wanglf/develop

Fixed #1612 missing field 'serial' in function to_csv()

netbox/dcim/models.py

@@ -296,6 +296,7 @@ def to_csv(self):
             self.tenant.name if self.tenant else None,
             self.role.name if self.role else None,
             self.get_type_display() if self.type else None,
+            self.serial,
             self.width,
             self.u_height,
             self.desc_units,