When I install Alyn on ubuntu16.04 via pip3,then I type a import alyn,I get the following message:

import alyn
Traceback (most recent call last):
File "", line 1, in
File "/usr/local/lib/python3.5/dist-packages/alyn-0.1.1-py3.5.egg/alyn/init.py", line 2, in

ImportError: No module named 'deskew'

can you help me figure out where is the problem?