v0.5.0

Changed

• BREAKING: VOCAB_CONTEXT_URL changes from https://w3id.org/byoe to
  https://w3id.org/byoe/v1, and the serialized file moves from
  contexts/byoe-v1.jsonld to contexts/v1.jsonld (VOCAB_CONTEXT_FILENAME).
  The versioned URL dereferences under the existing w3id.org redirect rule
  (/byoe/v1 to contexts/v1.jsonld on the GitHub Pages site); the bare
  /byoe path remains a redirect to the vocabulary homepage. The context
  contents are unchanged. Documents already minted with the bare URL are
  unaffected but will not dereference; consumers should mint against the
  versioned URL.