CompatHelper: bump compat for "DataFrames" to "0.22"

[github-actions[bot]]

This pull request changes the compat entry for the DataFrames package from 0.20.0, 0.21 to 0.20.0, 0.21, 0.22.

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-io]

Codecov Report

Merging #39 (994b65c) into master (9105c05) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #39   +/-   ##
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  Coverage   37.58%   37.58%           
=======================================
  Files           7        7           
  Lines         290      290           
=======================================
  Hits          109      109           
  Misses        181      181           

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