docs: fix example in README

[sid-maddy]

Also made the examples feel somewhat executable.

[codecov]

Codecov Report

Merging #9 (b70c484) into main (72a66ec) will decrease coverage by 0.95%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
- Coverage   95.29%   94.34%   -0.94%     
==========================================
  Files           3        3              
  Lines         106      106              
==========================================
- Hits          101      100       -1     
- Misses          5        6       +1     

Flag	Coverage Δ
pytest	94.34% <ø> (-0.94%)	⬇️
rust-llvm-cov	94.34% <ø> (-0.94%)	⬇️

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Impacted Files	Coverage Δ
src/lib.rs	94.74% <0.00%> (-5.26%)	⬇️

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[ionite34]

Looks good, thank you!