2.1.0

Enhancements

• Introduces a new ClaimSet structure. The structure can be returned from
  decode providing you convenience accessors. encode will now accept a
  ClaimSet.

  ClaimSet provides methods to manually validate individual claims.

  try claims.validateAudience("example.com")
  try claims.validateIssuer("fuller.li")
  try claims.validateExpiary()
  try claims.validateNotBefore()
  try claims.validateIssuedAt()