python3-xmodem: upgrade 0.4.6 -> 0.4.7

Changelog:
==========
  bugfix: stall on some kinds of error in recv(), PR #56
  bugfix: sequence number miscalculation in send(), PR #52
  enhancement: callback function added for recv() method, PR #53
  bugfix: receiving empty file and stall condition in recv(), PR #50
  bugfix: callback is now called for some kinds of errors and some CLI fixes, 8a798e8
  bugfix: remove DepreactionWarning for logging.warn(), PR #49

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>