update setup.py

[dzelge]

Setup is not copying data during installation. Please udpate setup in setup.py to:

setup(
    name="xcube_cci",
    version=version,
    description='An xcube plugin that allows generating data cubes from the ESA CCI Open Data Portal',
    license='MIT',
    author='xcube Development Team',
    packages=packages,
    include_package_data=True,
    data_files=[('xcube_cci', [
        'xcube_cci/data/non_cube_data_sources',
        'xcube_cci/data/excluded_data_sources']
                 )],
    install_requires=requirements,
)