Extract description from README.md, for PyPI's usage

def get_long_description():
    """Extract description from README.md, for PyPI's usage"""
    try:
        fpath = os.path.join(os.path.dirname(__file__), "README.md")
        with io.open(fpath, encoding="utf-8") as f:
            readme = f.read()
            desc = readme.partition("<!-- start_ppi_description -->")[2]
            desc = desc.partition("<!-- stop_ppi_description -->")[0]
            return desc.strip()
    except IOError:
        return None