Create __init__.py

[AkshitRaizada]

Running main.py after installation gives this error:-

Traceback (most recent call last):
  File "main.py", line 13, in <module>
    from tools import check_labels as check
ImportError: cannot import name 'check_labels' from 'tools'

I have made a small change to remove this as mentioned in issue #142.

[naurril]

thanks!