update moodle2cc gem to 0.2.2

Change-Id: Ic00b3ace9a2016808ece2fb35c2e35d1d7aa98c8
Reviewed-on: https://gerrit.instructure.com/32808
Reviewed-by: Bracken Mosbacker <bracken@instructure.com>
Product-Review: Bracken Mosbacker <bracken@instructure.com>
QA-Review: Nathan Rogowski <nathan@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>