avoid rubygems warnings about dependency versioning
avoid rubygems warnings about dependency versioning

Change-Id: I321b01de61ec828075e4d5597b8e538553aabe6d
Reviewed-on: https://gerrit.instructure.com/43166
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Rob Orton <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

krrg/switchman,instructure/switchman,ccutrer/switchman,instructure/switchman