Add check_sponsor method to Partner resource

See merge request coopdevs/odoo-somconnexio-python-client!32

Remove Tryton references

See merge request coopdevs/odoo-somconnexio-python-client!31

With this endopoint we can check if a partner can sponsor new partners.
Using the sponsor_code and the vat we can found the partner and check if
has more slots to sponsor.

Allow to search products available for product_code

See merge request coopdevs/odoo-somconnexio-python-client!30

Add sponsor data to Partner resource

See merge request coopdevs/odoo-somconnexio-python-client!29

Remove manual step in publish job

See merge request coopdevs/odoo-somconnexio-python-client!28

Define envvars for tests as fixture

See merge request coopdevs/odoo-somconnexio-python-client!27

Add lang to search method of ProductCatalog resource

See merge request coopdevs/odoo-somconnexio-python-client!26

CA is the default lang

Move flake8 config to a separate file

See merge request coopdevs/odoo-somconnexio-python-client!25

Move dev dependencies to a rrequirements-dev file and fix the version

See merge request coopdevs/odoo-somconnexio-python-client!23

Fix url concatenation with urllib

See merge request coopdevs/odoo-somconnexio-python-client!22

The urllib jounurl tool is not present in Python 2.7 and we don't need
more support for that version.

This change fix the problems with the extra end slash in the URL variables.

Feature/tariffs endpoint

See merge request coopdevs/odoo-somconnexio-python-client!20