old_contents: from setuptools import find_packages
  from setuptools import setup
  import sys
  
  install_requires = [
      'cached-property',
      'chainer>=2.0.0',
      'future',
      'gym>=0.9.7',
      'numpy>=1.10.4',
      'pillow',
      'scipy',
  ]
  
  test_requires = [
      'pytest',
  ]
  
  if sys.version_info < (3, 2):
      install_requires.append('fastcache')
  
  if sys.version_info < (3, 4):
      install_requires.append('statistics')
  
  if sys.version_info < (3, 5):
      install_requires.append('funcsigs')
  
  setup(name='chainerrl',
        version='0.5.0',
        description='ChainerRL, a deep reinforcement learning library',
        author='Yasuhiro Fujita',
        author_email='fujita@preferred.jp',
        license='MIT License',
        packages=find_packages(),
        install_requires=install_requires,
        test_requires=test_requires)
  
new_contents: from setuptools import find_packages
  from setuptools import setup
  import sys
  
  install_requires = [
      'cached-property',
      'chainer>=2.0.0',
      'future',
      'gym>=0.9.7',
      'numpy>=1.10.4',
      'pillow',
      'scipy',
  ]
  
  test_requires = [
      'pytest',
  ]
  
  if sys.version_info < (3, 2):
      install_requires.append('fastcache')
  
  if sys.version_info < (3, 4):
      install_requires.append('statistics')
  
  if sys.version_info < (3, 5):
      install_requires.append('funcsigs')
  
  setup(name='chainerrl',
        version='0.5.0',
        description='ChainerRL, a deep reinforcement learning library',
        long_description=open('README.md').read(),
        long_description_content_type='text/markdown',
        author='Yasuhiro Fujita',
        author_email='fujita@preferred.jp',
        license='MIT License',
        packages=find_packages(),
        install_requires=install_requires,
        test_requires=test_requires)
  
subject: Add long_description for setup.py