old_contents: from setuptools import find_packages, setup
  
  setup(
      name='jupyter-notebook-gist',
      version='0.4.0',
      description='Create a gist from the Jupyter Notebook UI',
      author='Mozilla Firefox Data Platform',
      author_email='fx-data-platform@mozilla.com',
      packages=find_packages(where='src'),
      package_dir={'': 'src'},
      include_package_data=True,
      license='MPL2',
      install_requires=[
          'ipython >= 4',
          'notebook >= 4.2',
          'jupyter',
          'requests',
          'widgetsnbextension',
      ],
      url='https://github.com/mozilla/jupyter-notebook-gist',
      zip_safe=False,
  )
  
new_contents: from setuptools import find_packages, setup
  
  setup(
      name='jupyter-notebook-gist',
      version='0.4.0',
      description='Create a gist from the Jupyter Notebook UI',
      author='Mozilla Firefox Data Platform',
      author_email='fx-data-platform@mozilla.com',
      packages=find_packages(where='src'),
      package_dir={'': 'src'},
      include_package_data=True,
      license='MPL2',
      install_requires=[
          'ipython >= 4',
          'notebook >= 4.2',
          'jupyter',
          'requests',
          'six',
          'widgetsnbextension',
      ],
      url='https://github.com/mozilla/jupyter-notebook-gist',
      zip_safe=False,
  )
  
subject: Add six to the explicit dependencies