fix the issue #351

[LilyEvansHogwarts]

I fix the bug of num_cores parameter.

[LilyEvansHogwarts]

I read methods/bayesian_optimization.py and find the objective is defined as self.objective = SingleObjective(self.f, self.batch_size, self.funct_name). And I believe it should be changed into self.objective = SingleObjective(self.f, self.num_cores, self.funct_name). Otherwise, the num_cores parameter would be useless.

[LilyEvansHogwarts]

The original code in methods/bayesian_optimization.py
self.objective = SingleObjective(self.f, self.batch_size,self.objective_name)
I believe the code should be changed into:
self.objective = SingleObjective(self.f, self.num_cores,self.objective_name)

[LilyEvansHogwarts]

@apaleyes @lawrennd

[codecov-io]

Codecov Report

Merging #352 (f184bad) into master (0be0508) will decrease coverage by 0.36%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #352      +/-   ##
==========================================
- Coverage   77.44%   77.08%   -0.37%     
==========================================
  Files          97       97              
  Lines        4678     4678              
==========================================
- Hits         3623     3606      -17     
- Misses       1055     1072      +17     

Impacted Files	Coverage Δ
GPyOpt/methods/bayesian_optimization.py	88.88% <100.00%> (ø)
GPyOpt/core/task/objective.py	57.69% <0.00%> (-28.85%)	⬇️
GPyOpt/util/general.py	44.35% <0.00%> (-1.62%)	⬇️

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