Changed

* Use pytest for tests
* Project structure - merge with template project
* Use poetry instead of setuptools
* Separate integration tests from unit tests

Removed

* ZabbixSender class

Added

* Gitlab CI
* Dev script
* Integration tests setup manual

Running integration tests require
running counterparts - zabbix server, database
and web interface

so flake8 shut up

Just to hold two parameters we don't
need to implement class and force user to
create a new instance of it.
The server host and port can be passed as
parameter to send function.

Added
* Initial implementation