Add `class_weight` optimization example from #183

[codecov[bot]]

Codecov Report

Merging #184 into master will decrease coverage by 0.03%. The diff coverage is 60%.

@@            Coverage Diff             @@
##           master     #184      +/-   ##
==========================================
- Coverage   94.07%   94.03%   -0.04%     
==========================================
  Files          46       46              
  Lines        4961     4966       +5     
==========================================
+ Hits         4667     4670       +3     
- Misses        294      296       +2

Impacted Files	Coverage Δ
hyperparameter_hunter/experiments.py	92.05% <ø> (ø)	:arrow_up:
hyperparameter_hunter/models.py	79.5% <60%> (-0.84%)	:arrow_down:

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[coveralls]

Pull Request Test Coverage Report for Build 791

• 3 of 5 (60.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.03%) to 94.039%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
hyperparameter_hunter/models.py	3	5	60.0%
<!--	Total:	3	5	60.0%	-->

Totals
Change from base Build 787:	-0.03%
Covered Lines:	4670
Relevant Lines:	4966

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💛 - Coveralls