Dave Hylands c91727b75a tools: Fix pydfu.py to work with old and new versions of PyUSB
Update pydfu.py to match with the version from openmv.

I just updated the openmv version to work with both of the
PyUSB 1.0.0.b1 and 1.0.0.b2

See: https://github.com/walac/pyusb/blob/master/ReleaseNotes.rst
2015-07-06 09:56:12 -07:00
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