How to use the causalml.__version__ function in causalml

#source_encoding = 'utf-8-sig'

# The master toctree document.
master_doc = 'index'

# General information about the project.
project = u'causalml'
copyright = u'2019 Uber Technologies, Inc.'
author = 'CausalML'

# The version info for the project you're documenting, acts as replacement
# for |version| and |release|, also used in various other places throughout
# the built documents.
#
# The short X.Y version.
version = causalml.__version__
# The full version, including alpha/beta/rc tags.
# release = causalml.__version__

# The language for content autogenerated by Sphinx. Refer to documentation
# for a list of supported languages.
#language = None

# There are two options for replacing |today|: either, you set today to
# some non-false value, then it is used:
#today = ''
# Else, today_fmt is used as the format for a strftime call.
#today_fmt = '%B %d, %Y'

# List of patterns, relative to source directory, that match files and
# directories to ignore when looking for source files.
exclude_patterns = [

with open("requirements.txt") as f:
    requirements = f.readlines()

extensions = [
    Extension("causalml.inference.tree.causaltree",
              ["causalml/inference/tree/causaltree.pyx"],
              libraries=[],
              include_dirs=[np_get_include()],
              extra_compile_args=["-O3"])
]

packages = find_packages()

setup(
    name="causalml",
    version=causalml.__version__,
    author="Huigang Chen, Totte Harinen, Jeong-Yoon Lee, Mike Yung, Zhenyu Zhao",
    author_email="",
    description="Python Package for Uplift Modeling and Causal Inference with Machine Learning Algorithms",
    long_description=long_description,
    long_description_content_type="text/markdown",
    url="https://github.com/uber-common/causalml",
    packages=packages,
    python_requires=">=3.6",
    classifiers=[
        "Programming Language :: Python",
        "License :: OSI Approved :: Apache Software License",
        "Operating System :: OS Independent",
    ],
    setup_requires=[
        # Setuptools 18.0 properly handles Cython extensions.
        'setuptools>=18.0',