Fixed invalid include README.md file in MANIFEST.in

[suraneti]

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Step to reproduce: python setup.py egg_info

running egg_info
writing pylibra.egg-info/PKG-INFO
writing dependency_links to pylibra.egg-info/dependency_links.txt
writing requirements to pylibra.egg-info/requires.txt
writing top-level names to pylibra.egg-info/top_level.txt
reading manifest file 'pylibra.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no files found matching 'README'
writing manifest file 'pylibra.egg-info/SOURCES.txt'