correct version in pyproject.toml

[samuelcolvin]

ref #45

[codecov]

Codecov Report

Merging #46 (a145e6c) into main (593bccc) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #46   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines          666       666           
  Branches       167       167           
=========================================
  Hits           666       666           

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[mgorny]

Thanks!