Add compatibility with Black >= 22.1

[akaihola]

• Black compatibility module
• tests
• change log

Fixes #264.

[sourcery-ai]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 0.02%.

Quality metrics	Before	After	Change
Complexity	1.20 ⭐	1.21 ⭐	0.01 👎
Method Length	59.98 ⭐	58.75 ⭐	-1.23 👍
Working memory	7.83 🙂	7.86 🙂	0.03 👎
Quality	77.13% ⭐	77.15% ⭐	0.02% 👍

Other metrics	Before	After	Change
Lines	1266	1309	43

Changed files	Quality Before	Quality After	Quality Change
src/darker/config.py	91.55% ⭐	91.55% ⭐	0.00%
src/darker/import_sorting.py	84.58% ⭐	84.58% ⭐	0.00%
src/darker/tests/conftest.py	86.43% ⭐	86.43% ⭐	0.00%
src/darker/tests/test_black_diff.py	72.25% 🙂	72.62% 🙂	0.37% 👍
src/darker/tests/test_import_sorting.py	85.54% ⭐	85.74% ⭐	0.20% 👍
src/darker/tests/test_main.py	67.97% 🙂	67.95% 🙂	-0.02% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
src/darker/tests/test_main.py	test_main	6 ⭐	433.96 ⛔	25 ⛔	30.26% 😞	Try splitting into smaller methods. Extract out complex expressions
src/darker/tests/test_black_diff.py	test_filter_python_files	4 ⭐	240.99 ⛔	11 😞	49.88% 😞	Try splitting into smaller methods. Extract out complex expressions
src/darker/tests/test_main.py	test_format_edited_parts	0 ⭐	195.99 😞	15 😞	50.84% 🙂	Try splitting into smaller methods. Extract out complex expressions
src/darker/tests/test_main.py	test_reformat_single_file	0 ⭐	113 🙂	18 ⛔	56.42% 🙂	Extract out complex expressions
src/darker/tests/test_main.py	test_format_edited_parts_historical	0 ⭐	162 😞	11 😞	59.80% 🙂	Try splitting into smaller methods. Extract out complex expressions

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• ⛔ very poor

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[akaihola]

@jedie feel free to accept my invitation as a collaborator and review this PR!

[roniemartinez]

@akaihola when do you plan to release the fix? This fix is not available in PyPI yet.

[akaihola]

@roniemartinez I'm allocating enough time for making the release today finally. I'll also drop a couple of other pull requests which are waiting for review, they'll wait for the next release so I can get this out faster.