How to use the fitlins.__version__ function in fitlins

def write_derivative_description(bids_dir, deriv_dir):
    from fitlins import __version__

    desc = {
        'Name': 'Fitlins output',
        'BIDSVersion': '1.1.0',
        'PipelineDescription': {
            'Name': 'FitLins',
            'Version': __version__,
            'CodeURL': 'https://github.com/poldracklab/fitlins',
            },
        'CodeURL': 'https://github.com/poldracklab/fitlins',
        'HowToAcknowledge': 'https://github.com/poldracklab/fitlins',
        }

    # Keys that can only be set by environment
    if 'FITLINS_DOCKER_TAG' in os.environ:
        desc['DockerHubContainerTag'] = os.environ['FITLINS_DOCKER_TAG']
    if 'FITLINS_SINGULARITY_URL' in os.environ:
        singularity_url = os.environ['FITLINS_SINGULARITY_URL']
        desc['SingularityContainerURL'] = singularity_url
        try:
            desc['SingularityContainerMD5'] = _get_shub_version(singularity_url)
        except ValueError:
            pass

def get_parser():
    """Build parser object"""
    verstr = 'fitlins v{}'.format(__version__)

    parser = ArgumentParser(description='FitLins: Workflows for Fitting Linear models to fMRI',
                            formatter_class=RawTextHelpFormatter)

    # Arguments as specified by BIDS-Apps
    # required, positional arguments
    # IMPORTANT: they must go directly with the parser object
    parser.add_argument('bids_dir', action='store', type=op.abspath,
                        help='the root folder of a BIDS valid dataset (sub-XXXXX folders should '
                             'be found at the top level in this folder).')
    parser.add_argument('output_dir', action='store', type=op.abspath,
                        help='the output path for the outcomes of preprocessing and visual '
                             'reports')
    parser.add_argument('analysis_level', choices=['run', 'session', 'participant', 'dataset'],
                        help='processing stage to be runa (see BIDS-Apps specification).')

if opts.work_dir:
        # dump crashes in working directory (non /tmp)
        fitlins_wf.config['execution']['crashdump_dir'] = opts.work_dir
    # easy to read crashfiles
    fitlins_wf.config['execution']['crashfile_format'] = 'txt'
    retcode = 0
    if not opts.reports_only:
        try:
            fitlins_wf.run(**plugin_settings)
        except Exception:
            retcode = 1

    models = auto_model(layout) if model == 'default' else [model]

    run_context = {'version': __version__,
                   'command': ' '.join(sys.argv),
                   'timestamp': time.strftime('%Y-%m-%d %H:%M:%S %z'),
                   }

    selectors = {'desc': opts.desc_label}
    if opts.space is not None:
        selectors['space'] = opts.space
    if subject_list is not None:
        selectors['subject'] = subject_list

    for model in models:
        analysis = Analysis(layout, model=model)
        analysis.setup(**selectors)
        report_dict = build_report_dict(deriv_dir, work_dir, analysis)
        write_full_report(report_dict, run_context, deriv_dir)

layout = BIDSLayout(opts.bids_dir,
                        derivatives=derivatives,
                        ignore=ignore,
                        force_index=force_index,
                        database_path=database_path,
                        reset_database=reset_database)

    subject_list = None
    if opts.participant_label is not None:
        subject_list = bids.collect_participants(
            layout, participant_label=opts.participant_label)

    # Build main workflow
    logger.log(25, INIT_MSG(
        version=__version__,
        subject_list=subject_list)
    )

    fitlins_wf = init_fitlins_wf(
        database_path, deriv_dir,
        analysis_level=opts.analysis_level, model=model,
        space=opts.space, desc=opts.desc_label,
        participants=subject_list, base_dir=work_dir,
        smoothing=opts.smoothing, drop_missing=opts.drop_missing,
        )

    if opts.work_dir:
        # dump crashes in working directory (non /tmp)
        fitlins_wf.config['execution']['crashdump_dir'] = opts.work_dir
    # easy to read crashfiles
    fitlins_wf.config['execution']['crashfile_format'] = 'txt'