message: override nameLookupURL if not given
diff: @@ -166,6 +166,7 @@ export function handlePendingSignIn(nameLookupURL: string = '',
  Logger.info(`Overriding ${config.network.blockstackAPIUrl} ` +
  `with ${tokenPayload.blockstackAPIUrl}`)
  config.network.blockstackAPIUrl = tokenPayload.blockstackAPIUrl
  + nameLookupURL = `${tokenPayload.blockstackAPIUrl}/v1/names`
  }
  }
  return verifyAuthResponse(authResponseToken, nameLookupURL)
  