message: workaround to fix deprecated .gcd function
diff: @@ -4,6 +4,7 @@ import fractions
  import array
  import time
  from odrive.dfuse.DfuState import DfuState
  +import math
  DFU_REQUEST_SEND = 0x21
  DFU_REQUEST_RECEIVE = 0xa1
  @@ -189,7 +190,7 @@ class DfuDevice:
  self.set_alternate_safe(sector['alt'])
  self.set_address_safe(sector['addr'])
  - transfer_size = fractions.gcd(sector['len'], MAX_TRANSFER_SIZE)
  + transfer_size = math.gcd(sector['len'], MAX_TRANSFER_SIZE)
  blocks = [data[i:i + transfer_size] for i in range(0, len(data), transfer_size)]
  for blocknum, block in enumerate(blocks):
  @@ -208,7 +209,7 @@ class DfuDevice:
  self.set_alternate_safe(sector['alt'])
  self.set_address_safe(sector['addr'])
  - transfer_size = fractions.gcd(sector['len'], MAX_TRANSFER_SIZE)
  + transfer_size = math.gcd(sector['len'], MAX_TRANSFER_SIZE)
  #blocknum_offset = int((sector['addr'] - sector['baseaddr']) / transfer_size)
  