Set timeout to repeat input on key-press to 250ms

I struggled to distinguish between a simple key-stroke and a pressed
key, which should lead to repeat inputs. Initially I copied this value
from my macos-settings where I use the same keyboard, but it turns out
that the timing is somehow different.

Remember set this to 200ms on macos and 250ms on X11.

Note, I have no idea which one is more accurate, but since everything on
a mac feels (and is) slow I would guess linux is correct and apple lies.

.config/i3/config

@@ -105,7 +105,7 @@ exec_always --no-startup-id compton --config ~/.config/compton.conf -b
 # switch to screensaver after 1 hour w/o interaction 
 exec xset s 3600 3600
 # set a blazing fast keyboard repeat rate, and make it happen more quickly (defaults: 660/25) 
-exec xset r rate 200 100
+exec xset r rate 250 100
 
 # }}}