Update docstring for the verbosity parameter (now default to False).

[fdtomasi]

No description provided.

[codecov-io]

Codecov Report

Merging #148 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #148   +/-   ##
=======================================
  Coverage   76.74%   76.74%           
=======================================
  Files          92       92           
  Lines        4162     4162           
=======================================
  Hits         3194     3194           
  Misses        968      968

Impacted Files	Coverage Δ
GPyOpt/core/bo.py	57.89% <ø> (ø)	⬆️
GPyOpt/methods/bayesian_optimization.py	88.63% <ø> (ø)	⬆️

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