v0.6.0

• BREAKING: This PR reverts the API change made to the verify method in v0.5.0:

  -public function verify(string $token): VerifyResult
  +public function verify(string $token): string

  v0.5.0 mistakenly assumed state was part of the token, but it is simply returned in a query parameter state to the callback / redirect URI. As such, your application can extract it directly from the request.