more permission stuff

README.md

@@ -68,13 +68,6 @@ sudo key-mapper-service --setup-permissions
 # now log out and back in
 ```
 
-You also need the rights to write keycodes into your system. This seems to be
-already the case on some systems, but not all of them.
-
-```bash
-sudo setfacl -m u:$USER:rw- /dev/uinput
-```
-
 ##### Manjaro/Arch
 
 ```bash

bin/key-mapper-service

@@ -96,12 +96,12 @@ if __name__ == '__main__':
             sys.exit(1)
 
         if group_exists('input'):
-            run('usermod -a -G input $USER')
+            run(f'usermod -a -G input {USER}')
 
         if group_exists('plugdev'):
-            run('usermod -a -G plugdev $USER')
+            run(f'usermod -a -G plugdev {USER}')
 
-        run('setfacl -m u:$USER:rw- /dev/uinput')
+        run(f'setfacl -m u:{USER}:rw- /dev/uinput')
 
         logger.info(
             'For these changes to take effect log out and in. '