[Bro] Bro 2.6-beta3 available

[Jon Siwek]

A new beta/candidate for Bro 2.6, tagged -beta3, is now available at:

https://www.bro.org/download/index.html

The NEWS file contains the significant changes in relation to 2.5.x:

https://www.bro.org/documentation/beta/NEWS.bro.html

However, there's no major differences between -beta2 and -beta3, just
many bug fixes and internal changes related to the new Broker
communication system that we'd like to see tested more thoroughly.  So
please try it out and report any issues as it's hoped to finalize to
2.6 soon.

- Jon