Fix references to old `optimization_core`

[codecov[bot]]

Codecov Report

Merging #157 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #157   +/-   ##
======================================
  Coverage    93.7%   93.7%           
======================================
  Files          46      46           
  Lines        4829    4829           
======================================
  Hits         4525    4525           
  Misses        304     304

Impacted Files	Coverage Δ
hyperparameter_hunter/settings.py	93.75% <ø> (ø)	:arrow_up:
...unter/library_helpers/keras_optimization_helper.py	94.04% <ø> (ø)	:arrow_up:
hyperparameter_hunter/sentinels.py	97.1% <ø> (ø)	:arrow_up:
...er_hunter/optimization/backends/skopt/protocols.py	100% <ø> (ø)	:arrow_up:

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[coveralls]

Pull Request Test Coverage Report for Build 694

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 93.705%

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Totals
Change from base Build 692:	0.0%
Covered Lines:	4525
Relevant Lines:	4829

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💛 - Coveralls