CompatHelper: bump compat for StatsModels to 0.7 for package DiffinDiffsBase, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the StatsModels package from 0.6.18 to 0.6.18, 0.7 for package DiffinDiffsBase. 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 #24 (ba38374) into master (256c897) will decrease coverage by 32.03%. The diff coverage is n/a.

@@             Coverage Diff              @@
##            master      #24       +/-   ##
============================================
- Coverage   100.00%   67.97%   -32.03%     
============================================
  Files           15       15               
  Lines         1712     1711        -1     
============================================
- Hits          1712     1163      -549     
- Misses           0      548      +548     

see 10 files with indirect coverage changes

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