old_contents: """
  A monotonic clock using cffi's ABI mode.
  """
  
  from setuptools import setup, find_packages
  
  
  setup(
      name='monotone',
      version="17.0.0",
      package_dir={"": "src"},
      packages=find_packages(where="src"),
      setup_requires=["cffi>=1.0.0"],
      cffi_modules=["src/_build.py:ffibuilder"],
      install_requires=["cffi>=1.0.0"],
      classifiers=[
          "Programming Language :: Python :: 2.7",
      ],
      license="MIT",
  )
  
new_contents: """
  A monotonic clock using cffi's ABI mode.
  """
  
  from setuptools import setup, find_packages
  
  
  setup(
      name='monotone',
      version="17.0.0",
      package_dir={"": "src"},
      packages=find_packages(where="src"),
      setup_requires=["cffi>=1.0.0"],
      cffi_modules=["src/_build.py:ffibuilder"],
      install_requires=["cffi>=1.0.0"],
      extras_require={
          'dev': ["coverage", "hypothesis>=3.6.1", "pytest"],
      },
      classifiers=[
          "Programming Language :: Python :: 2.7",
      ],
      license="MIT",
  )
  
subject: add dev extra