Do not include tests in wheel

By installing, then uninstalling duniterpy from the test.pypi.org platform, pip ask me if I want to remove also tests package!

~/Documents/dev/python/duniter-python-api$ pip uninstall duniterpy
Uninstalling duniterpy-0.54.3:
  Would remove:
    /home/vit/.pyenv/versions/3.6.8/envs/duniterpy-env/lib/python3.6/site-packages/duniterpy-0.54.3.dist-info/*
    /home/vit/.pyenv/versions/3.6.8/envs/duniterpy-env/lib/python3.6/site-packages/duniterpy/*
    /home/vit/.pyenv/versions/3.6.8/envs/duniterpy-env/lib/python3.6/site-packages/tests/*
Proceed (y/n)? y
  Successfully uninstalled duniterpy-0.54.3

And yes, the tests folder/package is in the wheel tar.gz archive...

Tests package should be remove from the wheel...