Update outliers notebook

[alex-hse-repository]

IMPORTANT: Please do not create a Pull Request without creating an issue first.

Before submitting (must do checklist)

• Did you read the contribution guide?
• Did you update the docs? We use Numpy format for all the methods and classes.
• Did you write any new necessary tests?
• Did you update the CHANGELOG?

Type of Change

• Examples / docs / tutorials / contributors update
• Bug fix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves an existing feature)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Proposed Changes

Update outliers notebook with histogram method

Related Issue

Closing issues

closes #198

[codecov-commenter]

Codecov Report

Merging #252 (14fa696) into master (430aef6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #252   +/-   ##
=======================================
  Coverage   86.54%   86.54%           
=======================================
  Files          90       90           
  Lines        4265     4265           
=======================================
  Hits         3691     3691           
  Misses        574      574           

Impacted Files	Coverage Δ
etna/analysis/outliers/hist_outliers.py	77.07% <ø> (ø)

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