Missing files for running the test suite from tarball

[mcepl]

While packaging pytest-codspeed for openSUSE, I tried to run the test suite. I appreciate that you have included tests in your released tarball, but unfortunately a couple of crucial files are missing: tests/conftest.py, tests/examples/__init__.py, tests/examples/test_addition_fixture.py. When adding them (via a patch), the test suite passes. Thank you!

[prabel-dd]

It looks like you've added these files to the tarball here on Github - would you mind also adding them to the tarball on pypi?