OSC streaming requires Python 3

[dyfer]

It seems that the python-osc library, currently used for streaming OSC messages, works only in Python 3.

This was not immediately clear, as the documentations states that OpenBCI_Python works requires Python 2.7 or later, and other examples run fine in 2.7.

I personally was able to move to python 3 with my code, but since most everything else works on both python 2.7+ and 3 maybe there would be a way to maintain this compatibility? Or at least document the extra requirements for OSC streaming.