Fix setup.cfg keywords

author-email, home-page are aliases, replacing them for their final value

description-file -> long_description = file:

requires-python is old value and does not work, python-requires
is right metadata.

'python-requires' is introduced from PEP440 and requires-python was old value
in PEP345.
- https://packaging.python.org/guides/distributing-packages-using-setuptools/#python-requires
- https://www.python.org/dev/peps/pep-0345/#requires-python

Change-Id: I2d2cd5d660ef937bfe8445bae7cf6b279eb80b0f
1 file changed