[bugfix] ImportError: No module named models.

Traceback (most recent call last):
  File "./parser.py", line 19, in <module>
    from pypecsqlog.parser.update_db import InfosFinder
  File "/home/emanuele.tomasi/pypecsqlog/pypecsqlog/parser/update_db.py", line 6, in <module>
    from .models import Address, EntryLog, Filename
ImportError: No module named models