Incorrect datarate for AS923 in RP2-1.0.0 and later??

[ouoam]

After I read RP2-1.0.3 LoRaWAN Regional Parameters. I found that the receive windows datarate value did not limit to DR5 as before. So I start to search for the beginning of this change. And found this value has changed in RP002-1.0.0.

So does this need to change?

lorawan/band/band_as923.go

Lines 73 to 75 in 63df695

	if dr > 5 {
	dr = 5
	}