Add v1.3.4 upgrade script to main branch

install/upgrade/versions/1.3.4.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# Hestia Control Panel upgrade script for target version 1.3.4
+
+#######################################################################################
+#######                      Place additional commands below.                   #######
+#######################################################################################
+
+echo '[ * ] Updating System Administrator account permissions...'
+$HESTIA/bin/v-change-user-role admin admin
+
+# Send end-of-life notification to admin user on servers running Ubuntu 16.04
+if [ "$OS_TYPE" = "Ubuntu" ]; then
+    if [ "$OS_VERSION" = '16.04' ]; then
+        $HESTIA/bin/v-add-user-notification admin 'IMPORTANT: End of support for Ubuntu 16.04 LTS' '<b>Hestia Control Panel no longer supports Ubuntu 16.04 LTS</b>, as a result your server will no longer receive upgrades or security patches after <b>v1.3.4</b>.<br><br>Please upgrade to a supported operating system.'
+    fi
+fi