v1.2.0

Changes
^^^^^^^

feature
"""""""

• migrate to poetry from setuptools as 'build-backend'

fix
"""

• add rule in MANIFEST to match tox.ini similar to *.md, etc non-python files
• replace hardcoded values with templated variables

test
""""

• sanity check to double check that 'tox.ini' gets put in generated dir

documentation
"""""""""""""

• rewrite module docstring

ci
""

• use checkout@v3 instead of @v1
• upload sdist & wheel as artefacts
• separate codecov data exchange into dedicated job