Update readme

Remove support for 16.04  + Version update

Author: jaapmarcus

README.md

@@ -2,7 +2,7 @@
 
 [Hestia Control Panel](https://www.hestiacp.com/)
 ==================================================
-**Latest stable release:** Version 1.3.5 | [View Changelog](https://github.com/hestiacp/hestiacp/blob/release/CHANGELOG.md)<br>
+**Latest stable release:** Version 1.4.0 | [View Changelog](https://github.com/hestiacp/hestiacp/blob/release/CHANGELOG.md)<br>
 
 **Web:** [www.hestiacp.com](https://www.hestiacp.com/)<br>
 **Documentation:** [docs.hestiacp.com](https://docs.hestiacp.com/)<br>
@@ -21,16 +21,16 @@ Features and Services
 * Apache2 and NGINX with PHP-FPM
 * Multiple PHP versions (5.6 - 8.0, 7.4 as default)
 * DNS Server (Bind) with clustering capabilities
-* POP/IMAP/SMTP mail services with Anti-Virus, Anti-Spam, and Webmail (ClamAV, SpamAssassin, and Roundcube)
+* POP/IMAP/SMTP mail services with Anti-Virus, Anti-Spam, and Webmail (ClamAV, SpamAssassin, Roundcube, Rainloop)
 * MariaDB or PostgreSQL databases
 * Let's Encrypt SSL support with wildcard certificates
 * Firewall with brute-force attack detection and IP lists (iptables, fail2ban, and ipset).
 
 Supported platforms and operating systems
 ----------------------------
 * **CPU Architecture:** AMD64 (x86_64 Intel/AMD)
-* **Debian:** 10, 9
-* **Ubuntu:** 20.04 LTS, 18.04 LTS, or 16.04 LTS
+* **Debian:** 10 or 9
+* **Ubuntu:** 20.04 LTS or 18.04 LTS
 * **NOTE:** Hestia Control Panel must be installed on top of a fresh operating system installation to ensure proper functionality.
 
 Installing Hestia Control Panel