old_contents: from setuptools import find_packages, setup
  
  
  setup(
      name='tchannel',
      version='0.1.0+dev0',
      author='Aiden Scandella',
      author_email='dev@uber.com',
      description='Network multiplexing and framing protocol for RPC',
      license='MIT',
      url='https://github.com/uber/tchannel',
      packages=find_packages(),
      install_requires=[],
      entry_points={
          'console_scripts': [
              'tcurl.py = tchannel.tcurl:main'
          ]
      },
  )
  
new_contents: from setuptools import find_packages, setup
  
  
  setup(
      name='tchannel',
      version='0.1.0+dev0',
      author='Aiden Scandella',
      author_email='dev@uber.com',
      description='Network multiplexing and framing protocol for RPC',
      license='MIT',
      url='https://github.com/uber/tchannel',
      packages=find_packages(),
      install_requires=[
          'contextlib2',
      ],
      entry_points={
          'console_scripts': [
              'tcurl.py = tchannel.tcurl:main'
          ]
      },
  )
  
subject: add missing requirement