Make `model_init_params` optional kwarg

[codecov[bot]]

Codecov Report

Merging #148 into master will increase coverage by <.01%. The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #148      +/-   ##
=========================================
+ Coverage    91.9%   91.9%   +<.01%     
=========================================
  Files          44      44              
  Lines        4362    4363       +1     
=========================================
+ Hits         4009    4010       +1     
  Misses        353     353

Impacted Files	Coverage Δ
hyperparameter_hunter/experiments.py	92.02% <100%> (+0.02%)	:arrow_up:

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[coveralls]

Pull Request Test Coverage Report for Build 653

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.002%) to 91.909%

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Totals
Change from base Build 651:	0.002%
Covered Lines:	4010
Relevant Lines:	4363

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💛 - Coveralls