fix encoding issue in spec for ruby 2.1.3

Change-Id: If2c4b22451272111577f03b891ac91e5a9c01d6b
Reviewed-on: https://gerrit.instructure.com/42283
Reviewed-by: Bryan Madsen <bryan@instructure.com>
Product-Review: Bryan Madsen <bryan@instructure.com>
QA-Review: Bryan Madsen <bryan@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Brian Palmer <brianp@instructure.com>
Reviewed-by: Nick Cloward <ncloward@instructure.com>
Reviewed-by: Rob Orton <rob@instructure.com>