Add content type for long description for twine

Extend setup.py with the following to silence twine warning:
  long_description_content_type="text/x-rst",

Signed-off-by: Lott, Christopher (cl778h) <cl778h@att.com>
Change-Id: I831e38f56a42d9ff46da9b1b2aa47eee26e4ecd2
1 file changed