change Deprecation warning to Error

[bwheelz36]

address issues raised in #405

[bwheelz36]

ok turns out the coverage approach is deprecated, will fix in a different PR

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (cf13889) 98.57% compared to head (57ad6ef) 98.57%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #406   +/-   ##
=======================================
  Coverage   98.57%   98.57%           
=======================================
  Files           8        8           
  Lines         560      560           
  Branches       79       79           
=======================================
  Hits          552      552           
  Misses          4        4           
  Partials        4        4           

Impacted Files	Coverage Δ
bayes_opt/bayesian_optimization.py	100.00% <ø> (ø)

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