old_contents: from setuptools import setup
  
  setup(
      name='watson',
      version='0.1',
      py_modules=['watson'],
      install_requires=[
          'Click',
          'arrow',
          'requests'
      ],
      entry_points={
          'console_scripts': [
              'watson = watson:cli',
          ],
          'gui_scripts': [
              'watson-systray = gui.__main__:main',
          ]
      }
  )
  
new_contents: from setuptools import setup
  
  setup(
      name='watson',
      version='0.1',
      py_modules=['watson', 'gui'],
      install_requires=[
          'Click',
          'arrow',
          'requests'
      ],
      entry_points={
          'console_scripts': [
              'watson = watson:cli',
          ],
          'gui_scripts': [
              'watson-systray = gui.__main__:main',
          ]
      }
  )
  
subject: Add 'gui' to modules list in setup.py