Add init logging in debug mode

Added log call for init of devices. The whole point of debug mode is
to get more info, so not saying what you're doing isn't super helpful.

src/main.rs

@@ -118,6 +118,7 @@ fn main(){
                     device.brighten_screen();
                     if args.debug{
                         let location = device.get_location();
+                        log::info!("Init device {}...", location);
                         device.set_serial(&location);
                     }
                     else{