Change demo in README.rst.

[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 #194 (8e642a4) into main (318b668) will decrease coverage by 22.64%.
The diff coverage is n/a.

❗ Current head 8e642a4 differs from pull request most recent head 488ac29. Consider uploading reports for the commit 488ac29 to get more accurate results

@@             Coverage Diff             @@
##             main     #194       +/-   ##
===========================================
- Coverage   92.77%   70.12%   -22.65%     
===========================================
  Files          71       71               
  Lines        6725     6725               
===========================================
- Hits         6239     4716     -1523     
- Misses        486     2009     +1523     

Flag	Coverage Δ
end_to_end	?
integration	41.72% <ø> (ø)
unit	68.66% <ø> (ø)

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

Impacted Files	Coverage Δ
tests/test_debugging.py	30.43% <0.00%> (-68.85%)	⬇️
tests/test_clean.py	31.46% <0.00%> (-68.54%)	⬇️
tests/test_execute.py	33.06% <0.00%> (-66.94%)	⬇️
tests/test_profile.py	33.33% <0.00%> (-66.67%)	⬇️
tests/test_skipping.py	34.64% <0.00%> (-65.36%)	⬇️
tests/test_collect_command.py	32.12% <0.00%> (-65.29%)	⬇️
tests/test_graph.py	35.29% <0.00%> (-62.36%)	⬇️
tests/test_database.py	40.00% <0.00%> (-60.00%)	⬇️
tests/test_build.py	46.15% <0.00%> (-53.85%)	⬇️
tests/test_persist.py	47.88% <0.00%> (-52.12%)	⬇️
... and 37 more

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