Bro 2.6-beta available

The beta release for Bro 2.6 is now available for download at:

See the NEWS file for the most significant changes:

Feel free to file bugs on GitHub or ask broader questions on this
mailing list. Thanks to anyone that can help test and provide

(Note that the beta suffix is indeed starting at -beta2 this time as
it's just how things turned out...)

- Jon