Bump compat for HerbGrammar to 0.5

[github-actions]

This pull request changes the compat entry for the HerbGrammar package from ^0.4.0 to ^0.4.0, 0.5.
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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.88%. Comparing base (975df69) to head (0801fb7).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #36   +/-   ##
=======================================
  Coverage   27.88%   27.88%           
=======================================
  Files           1        1           
  Lines         104      104           
=======================================
  Hits           29       29           
  Misses         75       75           

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