EndSoftwareDownloadRequest missing serialisation

func (omci *EndSoftwareDownloadRequest) SerializeTo(...) does not work and leads to a crash.
Apart from the handling of further Instances as discussed above for the StartSoftwareDownload, obviously the correct relevant code fragment should be:
binary.BigEndian.PutUint32(bytes[0:4], omci.CRC32)
binary.BigEndian.PutUint32(bytes[4:8], omci.ImageSize)
bytes[8] = omci.NumberOfInstances
for index := 0; index < int(omci.NumberOfInstances); index++

{ binary.BigEndian.PutUint16(bytes[9+(index*2):], omci.ImageInstances[index]) }

Also serializing for EndSoftwareDownloadResponse looks a bit to far-going, but at least it seems to be usable.