CompatHelper: bump compat for PrettyTables to 2 for package DiffinDiffsBase, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the PrettyTables package from 1 to 1, 2 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 #20 (48b4c6a) into master (15df251) will decrease coverage by 4.78%. The diff coverage is n/a.

@@             Coverage Diff             @@
##            master      #20      +/-   ##
===========================================
- Coverage   100.00%   95.21%   -4.79%     
===========================================
  Files           15       15              
  Lines         1619     1694      +75     
===========================================
- Hits          1619     1613       -6     
- Misses           0       81      +81     

Impacted Files	Coverage Δ
lib/DiffinDiffsBase/src/operations.jl	89.03% <0.00%> (-10.97%)	:arrow_down:
lib/DiffinDiffsBase/src/terms.jl	90.90% <0.00%> (-9.10%)	:arrow_down:
lib/DiffinDiffsBase/src/utils.jl	91.89% <0.00%> (-8.11%)	:arrow_down:
lib/DiffinDiffsBase/src/ScaledArrays.jl	92.30% <0.00%> (-7.70%)	:arrow_down:
lib/DiffinDiffsBase/src/parallels.jl	92.53% <0.00%> (-7.47%)	:arrow_down:
lib/DiffinDiffsBase/src/did.jl	93.13% <0.00%> (-6.87%)	:arrow_down:
lib/DiffinDiffsBase/src/treatments.jl	93.75% <0.00%> (-6.25%)	:arrow_down:
lib/DiffinDiffsBase/src/tables.jl	93.82% <0.00%> (-6.18%)	:arrow_down:
lib/DiffinDiffsBase/src/time.jl	97.95% <0.00%> (-2.05%)	:arrow_down:
lib/DiffinDiffsBase/src/procedures.jl	99.15% <0.00%> (-0.85%)	:arrow_down:
... and 3 more

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