Project.toml: add a [compat] entry for julia; also, [compat] entries should not have the v in them

[DilumAluthge]

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[codecov]

Codecov Report

Merging #10 (326f605) into main (326f605) will not change coverage.
The diff coverage is n/a.

❗ Current head 326f605 differs from pull request most recent head acc6ec0. Consider uploading reports for the commit acc6ec0 to get more accurate results

@@            Coverage Diff            @@
##              main       #10   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            1         1           
  Lines           26        26           
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  Hits            26        26           

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