Physbo

What's Changed

New features

* Enable `get_post_fcov` methods to return posterior covariance matrices of Gaussian Process by passing `diag=False` (66, 67)

**Full Changelog**: https://github.com/issp-center-dev/PHYSBO/compare/v2.0.2...v2.1.0

What's Changed

Bugfixes

* `policy.load` fails with MPI (60, 61)
* `discrete_multi.policy.random_search` fails when initial_data was given (64, 65)

Improvement of documentation

* Improvement of README (62)
* Fixed broken links, added links to tutorials, ...

**Full Changelog**: https://github.com/issp-center-dev/PHYSBO/compare/v2.0.1...v2.0.2

This change makes it clear that code importing PHYSBO will not be affected by copyleft. However, if you modify and redistribute PHYSBO itself, copyleft will still apply, and you will need to redistribute it under MPL v2.
これにより、PHYSBO を import するコードについては、コピーレフトの影響を受けないことが明確になりました。一方、PHYSBO そのものを修正して再頒布する場合には、これまでと同様にコピーレフトが働き、MPL v2 の下で再頒布する必要があります。

What's Changed
* Change License to MPLv2 (https://github.com/issp-center-dev/PHYSBO/pull/55)
* Set the upper bound of numpy version (https://github.com/issp-center-dev/PHYSBO/pull/56)

**Full Changelog**: https://github.com/issp-center-dev/PHYSBO/compare/v1.1.1...v2.0.0