GuardDuty Member Account: Accept Invitation from Master Account

AWSTemplateFormatVersion: '2010-09-09'
Description: ''
Resources:
  GuardDuty:
    Type: 'AWS::GuardDuty::Detector'
    Properties:
      Enable: true
  GuardDutyMaster:
    Type: 'AWS::GuardDuty::Master'
    Properties:
      DetectorId:
        Ref: GuardDuty
      MasterId: ''
Parameters: {}
Metadata: {}
Conditions: {}