pyscf 1.6.4

pyscf 1.6.3

Update Change Log

Merge pull request #297 from sunqm/master

bump to version 1.6.1

Merge pull request #265 from sunqm/master

1.6 release

Merge pull request #263 from sunqm/master

1.5.5 release

Update version id to 1.5.4

1.5.3 release

Update version info

1.5.1 release