Do not strip .0 version for compatible releases

[jugmac00]

... as the complete version number is important.

See PEP 440 for more details
( https://www.python.org/dev/peps/pep-0440/#compatible-release ).

Fixes #24

modified: src/tox_ini_fmt/formatter/requires.py
modified: tests/formatter/test_requires.py

[codecov-commenter]

Codecov Report

Merging #30 into main will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #30   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          247       247           
  Branches        55        55           
=========================================
  Hits           247       247           

Flag	Coverage Δ
#tests	100.00% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/tox_ini_fmt/formatter/requires.py	100.00% <100.00%> (ø)

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[jugmac00]

As mentioned in #24 I have only taken care of the == and >= cases, e.g. not for the <= case.

It is too late to think this problem through :-)