old_contents: import setuptools
  
  setuptools.setup(
      name='duct',
      description='a library for shelling out and piping subprocesses',
      license='MIT',
      url='https://github.com/oconnor663/duct.py',
      author="Jack O'Connor",
      author_email='oconnor663@gmail.com',
      version='0.4.0',
      py_modules=['duct'],
  )
  
new_contents: import setuptools
  
  setuptools.setup(
      name='duct',
      description='a library for shelling out and piping subprocesses',
      license='MIT',
      url='https://github.com/oconnor663/duct.py',
      author="Jack O'Connor",
      author_email='oconnor663@gmail.com',
      version='0.5.0',
      py_modules=['duct'],
  )
  
subject: bump version to 0.5.0