CompatHelper: bump compat for "CategoricalArrays" to "0.7"

[github-actions]

This pull request changes the compat entry for the CategoricalArrays package from 0.5 to 0.5, 0.7.

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.

[bjarthur]

@CiaranOMara do you know why travis ran twice on this PR? on is labelled "pr" the other "push".

[codecov-io]

Codecov Report

Merging #1348 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1348   +/-   ##
=======================================
  Coverage   90.12%   90.12%           
=======================================
  Files          36       36           
  Lines        3940     3940           
=======================================
  Hits         3551     3551           
  Misses        389      389

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[CiaranOMara]

I'm gonna have to check out this CompatHelper for myself.

The pr hook is the "continuous integration branch protection" that is enabled on the github side; it does a build/test of the merge of the head branch with the base branch specified in the pull request.

The push hook is enabled on the Travis side with the "build pushed branches" setting; it does a build/test of the branch head. A whitelist/blacklist of branches can be set in the travis.yaml. I think adding the following to the travis.yaml would remove unnecessary CompatHelper builds/tests triggered by the push hook.

branches:
  except:
  - /^compathelper.*$/