old_contents: 
  
  from distutils.core import setup
  
  setup(name='slowboy',
        version='0.0.1',
        packages=['slowboy'],
        url='https://github.com/zmarvel/slowboy/',
        author='Zack Marvel',
        author_email='zpmarvel at gmail dot com',
        install_requires=[
            "Pillow==4.1.1",
            "PySDL2==0.9.5",
        ])
  
new_contents: 
  
  from distutils.core import setup
  
  setup(name='slowboy',
        version='0.0.1',
        packages=['slowboy'],
        url='https://github.com/zmarvel/slowboy/',
        author='Zack Marvel',
        author_email='zpmarvel at gmail dot com',
        install_requires=[
            "PySDL2",
        ],
        extras_require={
            "dev": [
                "Pillow",
                "pytest",
            ],
        }
       )
  
subject: Move Pillow to development deps; add pytest to development deps