Typo in TagWriter.py

[kimble4]

Looks like there's a typo in TagWriter.py:

def hexToBytes( epc ):
	assert len(epc) % 2 == 0, 'epc must be a byte multiple'
	return codec.decode(epc, 'hex_codec')

It should be codecs.decode, as the imported library is codecs

This function is only called if you specify a value for epcOld, hence this doesn't cause a problem for TagReadWrite.