Add note about forecast to documentation of models

[Mr-Geekman]

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

Related Issue

#105.

Closing issues

Closes #105.

[codecov-commenter]

Codecov Report

Merging #112 (5f4c29f) into master (262fa68) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #112   +/-   ##
=======================================
  Coverage   88.04%   88.04%           
=======================================
  Files          55       55           
  Lines        2542     2542           
=======================================
  Hits         2238     2238           
  Misses        304      304           

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