Jonathan Perret

Document or make optional the emission of leading END bytes

2

Currently `sliplib.encode` inserts an `END` (`0xc3`) byte at the start as well as the end of the SLIP packet: ```bash $ python -c 'import sliplib;print(sliplib.encode(b"abc"))' b'\xc0abc\xc0' ``` Reading the "nonstandard"...