Create AniMe device only if physical device exists

The call to create the device handler will return with an error if
the physical device doesn't exist, the device (if exists) is stored
in an option already so just keep that as `None` if errored.

Addresses issue #14

README.md

@@ -99,6 +99,10 @@ sudo systemctl enable rog-core.service
 
 Thanks to @aspann you can grab it here [sys-power/rog-core](https://lab.retarded.farm/zappel/zGentoo/-/tree/master/sys-power/rog-core)
 
+### Arch AUR
+
+You can find the thingimajig [here](https://aur.archlinux.org/packages/rog-core/)
+
 ## Updating
 
 Occasionally I might break things for you by tweaking or changing the config file layout. Usually this will mean you