Prepare 5.18.0 release

Author: jbonofre

README.md

@@ -1,7 +1,16 @@
 Welcome to Apache ActiveMQ 
 =======================================================================
 Apache ActiveMQ is a high performance Apache 2.0 licensed
-Message Broker and JMS 1.1 implementation.
+Message Broker.
+ActiveMQ supports several API and protocols:
+- JMS 1.1, 2.0.3, 3.1.0
+- AMQP
+- MQTT
+- HTTP/WS
+ActiveMQ also provides advanced features like:
+- network of brokers
+- scheduling
+- and much more!
 
 Getting Started
 ===============

SECURITY.md

@@ -4,6 +4,7 @@
 
 | Version | Supported          |
 | ------- | ------------------ |
+| 5.18.x   | :white_check_mark: |
 | 5.17.x   | :white_check_mark: |
 | 5.16.x   | :white_check_mark: |
 | <= 5.15.x | :x:                |