v0.6.1

Added

• repository.create-controller-unsupported-did-method-400 and
  space.update-controller-unsupported-did-method-400 in the spaces-api
  suite: a controller that is a valid DID of a method not in the spec's Space
  Controller DID Method Registry (did:web) is refused with 400
  invalid-request-body, on create and on update by the stored controller, and
  the update leaves the stored controller unchanged.