[ADD] module delivery_optional_invoice_line
[ADD] test/delivery_optional_invoice_line.yml
[IMP] Added description and changed the category
[IMP] Module description
[IMP] test/delivery_optional_invoice_line.yml
[FIX] Module decsription
[IMP] _prepare_shipping_invoice_line of delivery.py
[REM] key 'active' from the manifest file
Merge pull request #4 from tafaRU/adding_delivery_optional_invoice_line_7/master

[ADD] delivery_optional_invoice_line module v.7.0