Collates project README and latest changes.

def long_description():
    """ Collates project README and latest changes. """
    changes = latest_changes()
    changes[0] = "`Changes for v{}".format(changes[0][1:])
    changes[1] = '-' * len(changes[0])
    return "\n\n\n".join([
        read_file('README.rst'),
        '\n'.join(changes),
        "`Full changelog <{}/en/develop/changelog.html#changelog>`_.".format(
            DOCUMENTATION_URL)])