Change split strings to byte arrays for drive detection

[oclyke]

Using python 3.7.2 on Windows 10 (version 1803, build 17134.472, and running in Bootcamp) I repeatedly got the following error:

Converting to uf2, output size: 50176, start address: 0x8000000
Traceback (most recent call last):
  File "uf2conv.py", line 292, in <module>
    main()
  File "uf2conv.py", line 279, in main
    drives = get_drives()
  File "uf2conv.py", line 176, in get_drives
    for line in r.split('\n'):
TypeError: a bytes-like object is required, not 'str'

As well as a similar error for the regular expressions split line immediately following. Changing the split strings to byte array objects solved the problem for me, as shown in this commit

[pieterconradie]

The patch did not work for me. I am a Python novice, but found this solution that worked for me:

Change line 176 "for line in r.split('\n'):" to "for line in r.decode().split('\n'):"

The function call "decode()" changes the byte array to a string for further processing.

Hope that helps!