Metric's representation in backtest

[julia-shenshina]

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[codecov-commenter]

Codecov Report

Merging #192 (28de5b0) into master (9a9f2c3) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #192      +/-   ##
==========================================
+ Coverage   87.83%   87.85%   +0.01%     
==========================================
  Files          75       75              
  Lines        3453     3458       +5     
==========================================
+ Hits         3033     3038       +5     
  Misses        420      420              

Impacted Files	Coverage Δ
etna/model_selection/backtest.py	97.60% <100.00%> (ø)
etna/pipeline/pipeline.py	99.28% <100.00%> (+0.02%)	⬆️

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[martins0n]

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