typo in "0_how_to_work_with_onnx" notebook

[amdPaek]

The first cell in this notebook has a typo:

#from qonnx.basic.util import qonnx_make_model
from qonnx.util.basic import qonnx_make_model

[maltanar]

Thanks @amdPaek , this was addressed in #81 .
For the future, please use the Issues tab to report issues instead.