add missing closing tag to README
add missing closing tag to README

Change-Id: I1c6f8aaf9c99ad8a91c09d3a02bd7245ea233fd1
Reviewed-on: https://gerrit.instructure.com/31777
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

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