message: add hubUrl field to the auth token jwt
diff: @@ -62,7 +62,7 @@ function makeLegacyAuthToken(challengeText: string, signerKeyHex: string): strin
  }
  }
  -function makeV1GaiaAuthToken(hubInfo: Object, signerKeyHex: string): string {
  +function makeV1GaiaAuthToken(hubInfo: Object, signerKeyHex: string, hubUrl: string): string {
  const challengeText = hubInfo.challenge_text
  const handlesV1Auth = (hubInfo.latest_auth_version &&
  parseInt(hubInfo.latest_auth_version.slice(1), 10) >= 1)
  @@ -74,7 +74,7 @@ function makeV1GaiaAuthToken(hubInfo: Object, signerKeyHex: string): string {
  const salt = crypto.randomBytes(16).toString('hex')
  const payload = { gaiaChallenge: challengeText,
  - iss, salt }
  + hubUrl, iss, salt }
  const token = new TokenSigner('ES256K', signerKeyHex).sign(payload)
  return `v1:${token}`
  }
  @@ -87,7 +87,7 @@ export function connectToGaiaHub(gaiaHubUrl: string,
  .then((response) => response.json())
  .then((hubInfo) => {
  const readURL = hubInfo.read_url_prefix
  - const token = makeV1GaiaAuthToken(hubInfo, challengeSignerHex)
  + const token = makeV1GaiaAuthToken(hubInfo, challengeSignerHex, gaiaHubUrl)
  const address = hexStringToECPair(challengeSignerHex +
  (challengeSignerHex.length === 64 ? '01' : ''))
  .getAddress()
  