Update to 3.1.0-4

Add pre_remove hook to fix attributes for data files.
This is dirty, but it is how nordvpn does upstream too.

Adjust PKGBUILD as there is now only 1 systemd service again.

Do not ship with the SysV files as arch is a systemd distro.

nordvpn-bin.install

@@ -1,13 +1,8 @@
 post_install() {
-  echo ':: In order to enable nordvpn you have to start two services:'
-  echo '     sudo systemctl enable --now nordvpnsd'
-  echo '     systemctl --user enable --now nordvpnud'
+  echo ':: In order to enable nordvpn you have to start the following service:'
+  echo '     sudo systemctl enable --now nordvpnd'
 }
 
-post_upgrade() {
-  if [ $(vercmp $2 3.0.0_4-1) -lt 0 ]; then
-    echo ':: In order to enable nordvpn you have to start two services:'
-    echo '     sudo systemctl enable --now nordvpnsd'
-    echo '     systemctl --user enable --now nordvpnud'
-  fi
+pre_remove() {
+  chattr -i /var/lib/nordvpn/data/*
 }