Remove deprecated Python versions

[cdorsman]

There are multiple references to Python versions that are officially EOL. And there is no support for newer versions yet.

[faif]

Hi. Where are the references to specific versions? In the linter?

[cdorsman]

From the files I found:

python-patterns/blob/master/setup.cfg
python-patterns/blob/master/setup.py (Python 2 and 2.7 is even mentioned)
python-patterns/blob/master/.travis.yml
python-patterns/blob/master/lint.sh
python-patterns/blob/master/tox.ini

According to https://devguide.python.org/versions 3.8 is already deprecated and 3.9 is later this year.

[faif]

Good catch, thanks. Feel free to create a pull request to address this.

[cdorsman]

Wel. I would love to. But.

It didn't occur to me at first, but there are two things I want to point out:

• In the README there is something like "2.7" compatibility flag. Is this still a thing?

If not. It will means that the patterns need to be checked as well if this flag is still defined.

• The possibility to replace setup.* with pyproject.toml.
  Bring the project right more up-to-date

I can still remove the old 3.8 and 3.9 out and include 3.10 to 3.13.

[faif]

There's no need for backwards compatibility. People who really want 2.x compatible code can checkout the legacy branch. Replacing the older with newer versions sounds good

[cdorsman]

I have added a PR for solving the issue