Regression in support for Python 3.6 as well as 3.7 in 1.0.7 release

[nkaminski]

As of the latest release on PyPi, I have observed that this package indicates support for Python >=3.6 in its package metadata, however is presently only compatible with Python versions 3.8 or later after the introduction of commit 377c70d

Therefore, would it be possible to either:

• Increment the minimum Python to 3.7 (or later) per Correct Python <= 3.7 compatibility regression in commit 377c70d #256
• Revert the incompatible changes to the type annotations introduced in the above commit

[rillbert]

Maybe I'm missing someting in my setup but it doesn't work in my 3.8 setup either.

The type hints in the environment.py file from the commit indicated in the previous comment makes it impossible for me to run shiv at all.

A possible work-around (it works in my, so-far limited, testing) is to add the line:
from __future__ import annotations
as the first code line in environment.py.

(as mentioned here: https://stackoverflow.com/a/75317316)