Upgrade bleach version to 2.0.0
Upgrade bleach version to 2.0.0

This is needed to fix the breaking incompatibility with html5 lib.

https://github.com/mozilla/bleach/issues/229

ministryofjustice/cla_backend,ministryofjustice/cla_backend,ministryofjustice/cla_backend,ministryofjustice/cla_backend