old_contents: from setuptools import setup, find_packages
  
  import latools
  
  with open("README.md", "r") as fh:
      long_description = fh.read()
  
  setup(name='latools',
        version=latools.__version__,
        description='Tools for LA-ICPMS data analysis.',
        long_description=long_description,
        long_description_content_type="text/markdown",
        url='https://github.com/oscarbranson/latools',
        author='Oscar Branson',
        author_email='oscarbranson@gmail.com',
        license='MIT',
        packages=find_packages(),
        classifiers=['Development Status :: 4 - Beta',
                     'Intended Audience :: Science/Research',
                     'Topic :: Scientific/Engineering',
                     'Programming Language :: Python :: 2',
                     'Programming Language :: Python :: 3',
                     ],
        python_requires='>3.6',
        install_requires=['numpy',
                          'pandas',
                          'matplotlib',
                          'uncertainties',
                          'sklearn',
                          'scipy',
                          'Ipython',
                          'configparser',
                          'tqdm'
                          ],
        package_data={
          'latools': ['latools.cfg',
                      'resources/*',
                      'resources/data_formats/*',
                      'resources/test_data/*'],
        },
        zip_safe=False)
  
new_contents: from setuptools import setup, find_packages
  
  import latools
  
  with open("README.md", "r") as fh:
      long_description = fh.read()
  
  setup(name='latools',
        version=latools.__version__,
        description='Tools for LA-ICPMS data analysis.',
        long_description=long_description,
        long_description_content_type="text/markdown",
        url='https://github.com/oscarbranson/latools',
        author='Oscar Branson',
        author_email='oscarbranson@gmail.com',
        license='MIT',
        packages=find_packages(),
        classifiers=['Development Status :: 4 - Beta',
                     'Intended Audience :: Science/Research',
                     'Topic :: Scientific/Engineering',
                     'Programming Language :: Python :: 2',
                     'Programming Language :: Python :: 3',
                     ],
        python_requires='>3.6',
        install_requires=['numpy',
                          'pandas',
                          'matplotlib',
                          'uncertainties',
                          'sklearn',
                          'scipy',
                          'Ipython',
                          'configparser',
                          'tqdm',
                          'python-dateutil'
                          ],
        package_data={
          'latools': ['latools.cfg',
                      'resources/*',
                      'resources/data_formats/*',
                      'resources/test_data/*'],
        },
        zip_safe=False)
  
subject: add dateutil to setup.py