Suppress pylint "Unable to import" error

pylint fails because it can't import requests_kerberos.  This is a
false positive; we already have handling of import failure.

Change-Id: I1641528b8358a8916dfcf4c67e680a03118b3913
Update change log for 0.2.0

Change-Id: Id87cffa0938c7cd203d91b91be85a13ee4e4afd4
Bump version to 0.2.0

Change-Id: I031b9293fd6ae3afe28e114b8d5ecc6de34f1bb3