bump baggageclaim
bump baggageclaim

Submodule src/github.com/concourse/baggageclaim 31d3d15..89252af:
  > move volumes to the dead dir before destroying
  > put a godoc on it

zachgersh/concourse,cjcjameson/concourse,concourse/concourse,longnguyen11288/concourse,concourse/concourse,zachgersh/concourse,CloudCredo/concourse,concourse/concourse,cjcjameson/concourse,zachgersh/concourse,cjcjameson/concourse,CloudCredo/concourse,longnguyen11288/concourse,concourse/concourse,concourse/concourse,longnguyen11288/concourse,CloudCredo/concourse