Add catboost 1.2.7

[mirecl]

Add catboost 1.2.7

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.33%. Comparing base (c0053e6) to head (7c8a34c).
Report is 11 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #28   +/-   ##
=======================================
  Coverage   83.33%   83.33%           
=======================================
  Files           1        1           
  Lines         174      174           
=======================================
  Hits          145      145           
  Misses         18       18           
  Partials       11       11           

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