Bump vcap_staging gem

git shortlog 82537da865356..d0277dd1d2e3f2

  David Sabeti and Jennifer Hickey (5):
    Rip out staging plugins
    Modify README to trigger Travis
    Again, modify readme to trigger travis
    Undo changed to readme... to trigger travis
    Bump Java buildpack

  Matt Reider (1):
    Update README.md

Change-Id: I38abe542ec47d95dde50d5faa24f25dba6ca22ac