XBee Python library 1.1.1

v1.1.1 - 04/25/2018

• Add support for DigiMesh and 802.15.4 protocols on XBee3 modules.
• Return an unknown XBee packet when the received packet is not supported by
  the library instead of raising an exception.
• Change logging handler to log messages in the console.
• Bug Fixing:
  • Fix a problem when closing the device connection in the reader.
  • Fix how is determined whether the module has entered in AT command mode
    or not.
  • Fix the string encoding and decoding in some API packets.
  • Fix the message displayed when the XBee device protocol is not correct one.