Log Message:
py-pkginfo: updated to 1.4.2

1.4.2:
Use relative imports in pkginfo modules. Supports vendoring of the package into \ 
setuptools.
Add support for Provides-Extra and Description-Content-Type fields. Per \ 
https://packaging.python.org/specifications/. See: PEP 566.
Remove support for old setuptools leaving PKG-INFO in the root of the project \ 
directory.