[maven-release-plugin] prepare release basiclti-2.1.0

git-svn-id: https://source.sakaiproject.org/svn/basiclti/branches/basiclti-2.1.x@125312 66ffb92e-73f9-0310-93c1-f5514f145a0a
Jenkins post-build: Auto-updating master version to 2.9-SNAPSHOT for next release http://builds.sakaiproject.org:8080/job/basiclti%202.1.x/

git-svn-id: https://source.sakaiproject.org/svn/basiclti/branches/basiclti-2.1.x@125313 66ffb92e-73f9-0310-93c1-f5514f145a0a