Replace InputDevice.fn accesses with InputDevice.path

[shicks]

The fn attribute was deprecated in evdev 1.0.0 (Jun 02, 2018), and has now been removed.

[Adam-Yung]

Please merge this, or else the current release will crash unless we manually patch it like below:

diff --git a/xkeysnail/input.py b/xkeysnail/input.py
index 8190949..f347038 100644
--- a/xkeysnail/input.py
+++ b/xkeysnail/input.py
@@ -33,7 +33,7 @@ def is_keyboard_device(device):

def print_device_list(devices):

• device_format = '{1.fn:<20} {1.name:<35} {1.phys}'

• device_format = '{1.fd:<20} {1.name:<35} {1.phys}'
  device_lines = [device_format.format(n, d) for n, d in enumerate(devices)]
  print('-' * len(max(device_lines, key=len)))
  print('{:<20} {:<35} {}'.format('Device', 'Name', 'Phys'))

[Pehrsons]

ping @mooz as this breaks downstream projects.