[master] Updated AUTHORS file with author of pull request #23.

AUTHORS

@@ -101,7 +101,10 @@ We have received the following contributions:
    2016-05: Added support for Cassandra
 
  - Patrik Lundin
-   2016-08: Replace test by expr for < in configure.ac
+   2016-07: Replace test by expr for < in configure.ac
+
+ - Michal Humpula
+   2016-07: Response to DHCPINFORM is sent to port 68
 
 Kea uses log4cplus (http://sourceforge.net/projects/log4cplus/) for logging,
 Boost (http://www.boost.org/) library for almost everything, and can use Botan