How to use the xenon.__version__ function in xenon

import os
from setuptools import setup
import xenon


with open(os.path.join(os.path.dirname(__file__), 'README.rst')) as fobj:
    readme = fobj.read()

with open(os.path.join(os.path.dirname(__file__), 'requirements.txt')) as fobj:
    reqs = fobj.read().splitlines()

setup(name='xenon',
      version=xenon.__version__,
      author='Michele Lacchia',
      author_email='michelelacchia@gmail.com',
      url='https://xenon.readthedocs.org/',
      download_url='https://pypi.python.org/xenon/',
      license='MIT',
      description='Monitor code metrics for Python on your CI server',
      platforms='any',
      long_description=readme,
      packages=['xenon'],
      tests_require=['tox', 'httpretty'],
      install_requires=reqs,
      entry_points={'console_scripts': ['xenon = xenon:main']},
      classifiers=[
          'Development Status :: 4 - Beta',
          'Environment :: Console',
          'Intended Audience :: Developers',