python -m gitlabber failed after install from source

Describe the bug A clear and concise description of what the bug is.

$ python2 -m gitlabber
Traceback (most recent call last):
  File "C:\PYTHON27\lib\runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "C:\PYTHON27\lib\runpy.py", line 72, in _run_code
    exec code in run_globals
  File "D:\work\0\0_as\1_open_source_demo\0_astute\gitlabber\gitlabber\__main__.py", line 1, in <module>
    from .cli import main
  File "gitlabber\cli.py", line 32
    elif args.dest is None and args.print is False:
                                        ^
SyntaxError: invalid syntax

To Reproduce

Include the full command line with all arguments and the output in verbose (-v) mode
```
git clone https://github.com/ezbz/gitlabber.git
cd gitlabber
python2 setup.py install
python2 -m gitlabber
```
Expected behavior A clear and concise description of what you expected to happen. python2 -m gitlabber run success

Versions (please complete the following information):

OS: [e.g. iOS] and version
Windows 10
Python Version [e.g. 2.6]
Python 2.7.10
Gitlab type [e.g. host, cloud] and Version [e.g. 14.0] where applicable
Gitlabber version [e.g. 1.18] master, commit id 408dd252745fe65252bbc04391a1bceb1f846a26

Additional context Add any other context about the problem here.

ezbz / gitlabber

python -m gitlabber failed after install from source #93