relax open4 gem requirement
relax open4 gem requirement

Change-Id: I7e5b91d03d9f982e4cf835c49f3239fc18e89e5a
Reviewed-on: https://gerrit.instructure.com/92405
Tested-by: Jenkins
Reviewed-by: Rob Orton <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

instructure/switchman,instructure/switchman