Avoid cost function ignored warning with LCB acquisition

[vmarkovtsev]

No description provided.

[codecov-io]

Codecov Report

Merging #190 into master will decrease coverage by 0.02%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master     #190      +/-   ##
==========================================
- Coverage   77.38%   77.36%   -0.03%     
==========================================
  Files          97       97              
  Lines        4603     4603              
==========================================
- Hits         3562     3561       -1     
- Misses       1041     1042       +1

Impacted Files	Coverage Δ
GPyOpt/util/arguments_manager.py	91.46% <50%> (ø)	⬆️
GPyOpt/acquisitions/LCB.py	94.73% <0%> (-5.27%)	⬇️

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