Update readme and release notes.

[tobiasraabe]

Changes

Provide a description and/or bullet points to describe the changes in this PR.

Todo

• Reference issues which can be closed due to this PR with "Closes #x".
• Review whether the documentation needs to be updated.
• Document PR in docs/changes.rst.

[codecov]

Codecov Report

Merging #37 (57e0404) into main (32db673) will increase coverage by 0.34%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #37      +/-   ##
==========================================
+ Coverage   98.08%   98.42%   +0.34%     
==========================================
  Files          17       17              
  Lines         573      573              
==========================================
+ Hits          562      564       +2     
+ Misses         11        9       -2     

Flag	Coverage Δ
end_to_end	92.67% <ø> (+0.34%)	⬆️
unit	59.51% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
tests/test_parallel.py	97.46% <0.00%> (+2.53%)	⬆️

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