Fastapi-mail

Upgraded fastapi version

Allow creating custom headers for attachments
Unit tests for attachments and with custom header attachments

Fixes 92

wjurkowlaniec Thank you for taking the time and helping with it.

Release applies changes on deployment, and validates path functions, Jinja templates, fixing failed tests.

To make it short deployment to PyPI has been modified from setup.py to poetry which is much more sense.
Validate path has been replaced with pydantic's DirectoryPath.
Added functionality to pass a list to the Jinja template.
Fixed tests on failures


Thanks a lot, andredias for its awesome PRs 87 89 .

Thanks to everyone for their participants during this section andredias Turall maestro-1, we can totally confirm this release brings brightness to our project.

Thanks to mmasztalerczuk