Use os.fsencode to encode path names from argv to byte strings.
Use os.fsencode to encode path names from argv to byte strings.

This is the proper way according to https://docs.python.org/3/library/os.html#file-names-command-line-arguments-and-environment-variables

Fixes #10.
Fixes #18.
Fixes #7.

google/adb-sync,google/adb-sync