Update README

Signed-off-by: Charith Ellawala <charith@lucidelectricdreams.com>

Author: charithe

README.md

@@ -45,6 +45,7 @@ Kafka Junit provides helpers for starting and tearing down a Kafka broker during
 | 4.2.5   | 3.5.0                                       |
 | 4.2.6   | 3.5.0 (Security update)                     |
 | 4.2.7   | 3.5.0 (Security update)                     |
+| 4.2.8   | 3.5.0 (Security update)                     |
 
 </details>