old_contents: #!/usr/bin/env python
  VERSION = "2015.0"
  
  from setuptools import find_packages, setup
  
  setup(
      name="solvertools",
      version=VERSION,
      packages=find_packages(),
      install_requires=[
          'numpy', 'nltk', 'whoosh', 'unidecode'
      ],
  )
  
new_contents: #!/usr/bin/env python
  VERSION = "2015.0"
  
  from setuptools import find_packages, setup
  
  setup(
      name="solvertools",
      version=VERSION,
      packages=find_packages(),
      install_requires=[
          'numpy', 'nltk', 'whoosh', 'unidecode', 'natsort'
      ],
  )
  
subject: add dependency on natsort