How to use the zict.__version__ function in zict

# The master toctree document.
master_doc = 'index'

# General information about the project.
project = 'zict'
copyright = '2016, Matthew Rocklin'
author = 'Matthew Rocklin'

# 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.
import zict
version = zict.__version__
# The full version, including alpha/beta/rc tags.
release = version

# Link to GitHub issues and pull requests using :pr:`1234` and :issue:`1234`
# syntax
extlinks = {
    "issue": ("https://github.com/dask/zict/issues/%s", "GH#"),
    "pr": ("https://github.com/dask/zict/pull/%s", "GH#"),
}

# The language for content autogenerated by Sphinx. Refer to documentation
# for a list of supported languages.
#
# This is also used if you do content translation via gettext catalogs.
# Usually you set "language" from the command line for these cases.
language = None