Update Python code for new clean signature

[ctrueden]

The clean function now requires cmdclean and convert flags to be given.

Or you could keep backwards compatibility by adding default values:

def clean(self, cmdclean=True, convert=True):

[ctrueden]

Also, the line:

    with PasswordStore('~/.password-store') as exporter:

did not work for me as written. You could consider changing it to:

    with PasswordStore(os.path.expanduser('~/.password-store')) as exporter:

Or do that internally inside the PasswordStore class.

[ctrueden]

And thank you for this super useful tool! :beers:

[roddhjav]

Thanks a lot. Merged. And also sorry for the delay.