CompatHelper: bump compat for Roots to 3, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Roots package from 0.7, 0.8, 1.0, 2 to 0.7, 0.8, 1.0, 2, 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-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.55%. Comparing base (8c4d2b9) to head (f97ba52).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #355   +/-   ##
=======================================
  Coverage   94.55%   94.55%           
=======================================
  Files          29       29           
  Lines        1836     1836           
=======================================
  Hits         1736     1736           
  Misses        100      100           

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