Broken support for Python 3.7

[AWhetter]

I'm unlucky enough to still need to make use of Python 3.7. Our Python 3.7 test suites are failing because pytest-factoryboy is importing importlib.metadata, however that library was added in Python 3.8.

I see Python 3.7 support was dropped in v2.6.0, however the project.toml still specifies python = ">=3.7". Please could that be updated, and v2.6.1 yanked from pypi so that pip does not pick up this broken release when running in Python 3.7.

[youtux]

I just published version 2.7.0. I won't yank 2.6.1, as it's a working build, just like 2.6.0.