Add support for `bytes`?

[5frank]

Sorry if this is stupid question, but could not bytes be added to the following tuple of supported types?

txdbus/txdbus/marshal.py

Line 525 in 17b620d

if isinstance(var, (list, tuple, bytearray)):

Currently this raises txdbus.error.MarshallingError: List, Tuple, Bytearray, or Dictionary required for DBus array if bytes are used.

[WhyNotHugo]

As per the pythons docs, they're usually fairly interchangeable, so this makes sense.