Add confidence intrvals to Prophet

[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

Add confidence interval to Prophet

Related Issue

Closing issues

[codecov-commenter]

Codecov Report

Merging #153 (4cc4d71) into master (50f2074) will decrease coverage by 0.27%.
The diff coverage is 97.22%.

@@            Coverage Diff             @@
##           master     #153      +/-   ##
==========================================
- Coverage   87.38%   87.11%   -0.28%     
==========================================
  Files          73       73              
  Lines        3164     3213      +49     
==========================================
+ Hits         2765     2799      +34     
- Misses        399      414      +15     

Impacted Files	Coverage Δ
etna/models/base.py	97.46% <ø> (ø)
etna/models/prophet.py	98.18% <97.22%> (-0.52%)	⬇️
etna/analysis/plotters.py	12.90% <0.00%> (-0.67%)	⬇️
etna/analysis/__init__.py	100.00% <0.00%> (ø)

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[martins0n]

Something strange happens.

[martins0n]

typing

[martins0n]

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Suggested change

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[martins0n]

👍