Python3.4.x compatibility

[gorghino]

Hi! I'm currently using an UDOO Neo with python 3.4.3
I cloned your pyUBX but python3 setup.py install fails at:

byte-compiling build/bdist.linux-armv7l/egg/ubx/UBX/ESF.py to ESF.cpython-34.pyc
  File "build/bdist.linux-armv7l/egg/ubx/UBX/ESF.py", line 37
    datas = (self.__getattribute__(f'data_{idx}') for idx in range(1, self.numMeas+1))
                                               ^
SyntaxError: invalid syntax

Thank you!