Also display helpful notes on upgrade/reinstall

.SRCINFO

@@ -1,7 +1,7 @@
 pkgbase = nordvpn-bin
 	pkgdesc = NordVPN CLI tool for Linux
 	pkgver = 3.8.8
-	pkgrel = 3
+	pkgrel = 4
 	url = https://nordvpn.com/download/linux/
 	install = nordvpn-bin.install
 	arch = x86_64

PKGBUILD

@@ -4,7 +4,7 @@
 
 pkgname=nordvpn-bin
 pkgver=3.8.8
-pkgrel=3
+pkgrel=4
 pkgdesc="NordVPN CLI tool for Linux"
 arch=('x86_64' 'i686' 'armv7h' 'aarch64')
 url="https://nordvpn.com/download/linux/"

nordvpn-bin.install

@@ -2,7 +2,16 @@ post_install() {
   echo ':: In order to enable nordvpn you have to start the following service:'
   echo '     sudo systemctl enable --now nordvpnd'
   echo ':: You have to add yourself to the nordvpn group:'
-  echo "     gpasswd -a USERNAME nordvpn"
+  echo "     sudo gpasswd -a USERNAME nordvpn"
+  echo ':: You then have to restart for the group to be created:'
+  echo "     reboot"
+}
+
+post_upgrade() {
+  echo ':: In order to enable nordvpn you have to start the following service:'
+  echo '     sudo systemctl enable --now nordvpnd'
+  echo ':: You have to add yourself to the nordvpn group:'
+  echo "     sudo gpasswd -a USERNAME nordvpn"
   echo ':: You then have to restart for the group to be created:'
   echo "     reboot"
 }