add missing closing tag to README

Change-Id: I1c6f8aaf9c99ad8a91c09d3a02bd7245ea233fd1
Reviewed-on: https://gerrit.instructure.com/31777
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>
bump to 1.0.0

feature complete enough to support canvas on rails 3

Change-Id: I26a9235411c258a59fbe522bf3b9d5f8a89c5157