CompatHelper: bump compat for Functors to 0.3, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the Functors package from 0.1, 0.2 to 0.1, 0.2, 0.3. This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry. It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov[bot]]

Codecov Report

Merging #461 (e5d19e8) into master (bda66f8) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #461   +/-   ##
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  Coverage   93.16%   93.16%           
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  Files          52       52           
  Lines        1259     1259           
=======================================
  Hits         1173     1173           
  Misses         86       86           

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[theogf]

Failures in tests are unrelated

[theogf]

Ah but it looks like something is holding up Functors to 0.2.8