Black-box Opt v0.5.0

Version with more documentation for all the software components, accessed via https://nrel.github.io/bbopt.
Multiple bug fixes and improvements in the methods.

What's Changed

• Adding optimization using Gaussian Process by @weslleyspereira in #2
• Fix wording samples -> sample points by @weslleyspereira in #4

New Contributors

• @weslleyspereira made their first contribution in #2

Full Changelog: v0.4.2...v0.5.0