4.0.0-beta1

Added

• Add ValidatorInterface::getPattern() to return the regular expression
  pattern used by the validator.
• Add v6() helper function for version 6 UUIDs.

Changed

• Set the pattern constants on validators as private. Use the getPattern()
  method instead.
• Change the $node parameter for UuidFactoryInterface::uuid6() to accept
  null or Type\Hexadecimal.
• Accept Type\Hexadecimal for the $node parameter for
  UuidFactoryInterface::uuid1(). This is in addition to the int|string types
  already accepted, so there are no BC breaks. Type\Hexadecimal is now the
  recommended type to pass for $node.

Removed

• Remove currentTime() method from Provider\Time\FixedTimeProvider and
  Provider\Time\SystemTimeProvider; it had previously been removed from
  Provider\TimeProviderInterface.