Update main.py to make it run

without the change:

# /usr/local/bin/smeterd -h
Traceback (most recent call last):
  File "/usr/local/bin/smeterd", line 9, in <module>
    load_entry_point('smeterd==1.7', 'console_scripts', 'smeterd')()
  File "/usr/local/lib/python2.7/site-packages/smeterd/main.py", line 110, in parse_and_run
    from pycli_tools import get_argparser
ImportError: cannot import name get_argparser

With the change no problem to run it. According docs it should be like this