6.2.0

CHANGES:

• New opam package "dnssec" implementing dnssec validation (@reynir @hannesm)
• Use custom log sources, not the default one from Logs (@reynir @hannesm)
• BUGFIX dns-resolver: unlisten on the listen port, not the packet src_port
  (#290 @hannesm)
• dns-resolver: add IPv6 addresses of root servers (fixes #262, @hannesm)
• dns-resolver: preliminary support for DNSSec (#262 @reynir @hannesm)
• dns-client: when /etc/resolv.conf modifies, update the list of nameservers
  (#291 @hannesm @reynir)
• dns-cli: update to cmdliner 1.1.0 (#300 @hannesm)
• dns-client-mirage: add module type and nameserver_of_string and connect to
  allow creation of a MirageOS device (#297 @dinosaure)
• dns-cache: add size, capacity, and weight to metrics (#301, fixes #299,
  @hannesm)