Prepare release

[bhirsz]

• use black formatting on our code
• update changelog
• bump version
• update docs

[codecov-commenter]

Codecov Report

Merging #214 (68d8789) into main (9d44048) will decrease coverage by 0.05%.
The diff coverage is 96.65%.

❗ Current head 68d8789 differs from pull request most recent head 533b9f6. Consider uploading reports for the commit 533b9f6 to get more accurate results

@@            Coverage Diff             @@
##             main     #214      +/-   ##
==========================================
- Coverage   96.18%   96.13%   -0.06%     
==========================================
  Files          31       31              
  Lines        1783     1784       +1     
==========================================
  Hits         1715     1715              
- Misses         68       69       +1     

Impacted Files	Coverage Δ
robotidy/__main__.py	0.00% <ø> (ø)
robotidy/decorators.py	92.30% <ø> (ø)
robotidy/cli.py	93.00% <83.33%> (ø)
robotidy/transformers/SplitTooLongLine.py	96.87% <83.33%> (ø)
robotidy/transformers/RenameKeywords.py	94.59% <88.88%> (ø)
robotidy/app.py	93.97% <90.00%> (ø)
robotidy/utils.py	97.25% <97.56%> (ø)
robotidy/__init__.py	100.00% <100.00%> (ø)
robotidy/api.py	95.83% <100.00%> (ø)
robotidy/files.py	96.38% <100.00%> (-1.21%)	⬇️
... and 21 more

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