Implement warning to make users aware of the missing check

[frenzymadness]

We are not currently capable of checking Python version specifiers
from Poetry specification because it's very complex. And right now
it's better to warn users about it than do nothing.

Related Issues and Dependencies

#187

This introduces a breaking change

• Yes
• No

[todo]

Implement or use external parser for Python versions in Poetry specification.

micropipenv/micropipenv.py

Lines 653 to 658 in 9919e28

	# TODO: Implement or use external parser for Python versions in Poetry specification.
	# See for details: https://github.com/thoth-station/micropipenv/issues/187
	current_python_version = "{}.{}".format(sys.version_info.major, sys.version_info.minor)
	wanted_python_version = poetry_lock["metadata"]["python-versions"]
	message = (
	"Warning: Currently, Micropipenv is not able to parse complex Python version specifications used by Poetry. "

---

This comment was generated by todo based on a TODO comment in 9919e28 in #214. cc @frenzymadness.

[sesheta]

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[fridex]

One minor comment, otherwise LGTM. Thanks! 👍🏻 (as it is Friday, I might revisit the review on Monday -- tired eyes 👼🏻 ).

[frenzymadness]

Applied, thanks a lot for the quick review, and feel free to leave the rest for Monday. We should also merge it manually to be able to squash it first.

[fridex]

LGTM, thanks! 👍🏻