v0.4.0

Added

• Add a second context document, the bare BYOE vocab context served at
  https://w3id.org/byoe (VOCAB_CONTEXT_URL / CONTEXT_VOCAB_V1, serialized
  to contexts/byoe-v1.jsonld). Defines the MultikeyCommitment
  verification-method type (https://w3id.org/security#MultikeyCommitment) and
  its publicKeyCommitment property
  (https://w3id.org/security#publicKeyCommitment, a plain string, not
  multibase), for did:webvh documents that publish hash-commitment verification
  methods.

Changed

• Vocab page: rename the descriptor-type entries collection to
  private-collection and shared-collection to shared-wallet-collection,
  matching the App Connect spec; the retired spellings are removed.
• Vocab page: mark the space entry reserved, matching the App Connect spec's
  reserved-descriptor table.