create a new changelog file for the next version

Author: vertigo17

source/pom.xml

@@ -25,7 +25,7 @@
 
     <groupId>org.cerberus</groupId>
     <artifactId>cerberus-core</artifactId>
-    <version>4.20</version>
+    <version>4.21-SNAPSHOT</version>
     <packaging>war</packaging>
 
     <name>Cerberus Core</name>