6.3.0

Feature

• bosh diff --check will now return exit status 2
  instead of exit status 1.
  This is so the 'diff' exit status is more easily differentiated
  from an 'error' exit status.

Bug Fixes

• When using collection with secrets,
  the GUID matching for maintaining GUIDs across updates faulted
  only when the tile was being upgraded and migrating said property.
  Related issue #514.