Feat: Se elimina una linea de la venta

tests/scenario_sale_line_delete_log.rst

@@ -161,9 +161,20 @@ Sale 5 products::
   >>> sale.lines.append(sale_line)
   >>> sale_line.product = product
   >>> sale_line.quantity = 3.0
-  >>> sale.click('quote')
-  >>> sale.untaxed_amount, sale.tax_amount, sale.total_amount
-  (Decimal('50.00'), Decimal('5.00'), Decimal('55.00'))
-  >>> sale.click('confirm')
+  >>> sale.save()
+  >>> len(sale.lines)
+  3
   >>> sale.untaxed_amount, sale.tax_amount, sale.total_amount
   (Decimal('50.00'), Decimal('5.00'), Decimal('55.00'))
+
+
+Delete a sale line::
+  
+  >>> sale.lines[0].delete()
+  >>> sale.save()
+  >>> len(sale.lines)
+  2
+
+
+
+