Sign in and get money.

def sign(conf):
    """Sign in and get money."""
    try:
        v2ex = V2ex(conf.config)
        v2ex.login()
        balance = v2ex.get_money()
        click.echo(balance)
    except KeyError:
        click.echo('Keyerror, please check your config file.')
    except IndexError:
        click.echo('Please check your username and password.')