Zeek 4.0.0 RC2 available

Zeek 4.0.0 RC2 is now available:

  https://zeek.org/get-zeek/

Most differences from RC1 can be found in the CHANGES files:

  https://github.com/zeek/zeek/blob/release/4.0/CHANGES

There is also a notable change in Broker that attempts to resolve a
fundamental issue with its internal design/architecture that has
potential to cause deadlocks in Zeek clusters, although that's never
been reported in practice.

General info about the upcoming Zeek 4.0.0 release can be found at
these locations (unchanged since last RC1 announcement):

  https://zeek.org/2020/12/15/zeek-4-0-release-candidate/
  https://github.com/zeek/zeek/releases/tag/v4.0.0-rc2