fixes inline plots in tutorial

[edublancas]

Describe your changes

• I noticed the tracker tutorial had a lot of duplicated plots (see the link), this fixes it
• this also applies a pending deprecation on ClassificationReport

Issue ticket number and link

Closes #x

Checklist before requesting a review

• [ ] I have performed a self-review of my code
• [ ] I have added thorough tests (when necessary).
• [ ] I have added the right documentation in the docstring and changelog (when needed)

[coveralls]

Pull Request Test Coverage Report for Build 4053958523

• 51 of 56 (91.07%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.1%) to 93.906%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/sklearn_evaluation/plot/util.py	4	9	44.44%
<!--	Total:	51	56	91.07%	-->

Totals
Change from base Build 4053917694:	-0.1%
Covered Lines:	2866
Relevant Lines:	3052

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💛 - Coveralls

[edublancas]

Where is it documented?

what? the deprecation? It was a pending deprecation, check out the changes

[idomic]

No no I mean this one: no_display_plots Also display_no_plots might be a better name

[edublancas]

Nothing has changed. no_display_plots is a context manager that's only applied when it's needed outside of it, behavior remains the same, check out the implementation

[edublancas]

Can the no_display_plots context affect the user experience when working with notebooks?

no, it won't.no_display_plots is only used when de-serializing plots from JSON stored in a database. We shouldn't display them in such cases since we're loading them to put them in a table-view.

after exiting the context manager all goes back to normal.