Add method keysIn

[zydmayday]

No description provided.

[codecov-commenter]

Codecov Report

Merging #124 (18a1d24) into main (d4a6deb) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #124      +/-   ##
==========================================
+ Coverage   96.83%   96.86%   +0.02%     
==========================================
  Files         166      167       +1     
  Lines        1676     1688      +12     
==========================================
+ Hits         1623     1635      +12     
  Misses         53       53              

Impacted Files	Coverage Δ
ramda/private/_xfBase.py	88.88% <ø> (ø)
ramda/__init__.py	100.00% <100.00%> (ø)
ramda/filter.py	100.00% <100.00%> (ø)
ramda/join.py	100.00% <100.00%> (ø)
ramda/keysIn.py	100.00% <100.00%> (ø)
ramda/private/_Set.py	100.00% <100.00%> (ø)
ramda/private/_createReduce.py	88.88% <100.00%> (ø)
ramda/private/_equals.py	100.00% <100.00%> (ø)
ramda/where.py	100.00% <100.00%> (ø)

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