Add preliminary notes for 1.8.5 (#4745)

notes/coredns-1.8.5.md

++++
+title = "CoreDNS-1.8.5 Release"
+description = "CoreDNS-1.8.5 Release Notes."
+tags = ["Release", "1.8.5", "Notes"]
+release = "1.8.5"
+date = 2021-05-28T07:00:00+00:00
+author = "coredns"
++++
+
+Blah blah blah
+
+## Brought to You By
+
+Chris O'Haver,
+Licht Takeuchi,
+mfleader,
+Miek Gieben,
+Ondřej Benkovský,
+Sven Nebel,
+Yong Tang.
+
+## Noteworthy Changes
+
+* core: Add -p for port flag (https://github.com/coredns/coredns/pull/4653)
+* core: Fix IPv6 case for CIDR format reverse zones (https://github.com/coredns/coredns/pull/4652)
+* core: Share plugins among zones in the same server block (https://github.com/coredns/coredns/pull/4593)
+* plugin/cache: Unset AD flag when DO is not set for cache miss (https://github.com/coredns/coredns/pull/4736)
+* plugin/errors: add configurable log level to errors plugin (https://github.com/coredns/coredns/pull/4718)
+* plugin/kubernetes: Add NS+hosts records to xfr response. Add coredns service to test data. (https://github.com/coredns/coredns/pull/4696)
+* plugin/log: do not log NOERROR in log plugin when response is not available (https://github.com/coredns/coredns/pull/4725)
+* plugin/log: fix closing of codeblock (https://github.com/coredns/coredns/pull/4680)
+* plugin/metrics: when no response is written, fallback to status of next plugin in prometheus plugin (https://github.com/coredns/coredns/pull/4727)
+* plugin/route53: Fix Route53 plugin cannot retrieve ECS Task Role (https://github.com/coredns/coredns/pull/4669)
+* plugin/secondary: doc updates (https://github.com/coredns/coredns/pull/4686)
+* plugin/secondary: Retry initial transfer until successful (https://github.com/coredns/coredns/pull/4663)
+* plugin/trace: fix rcode tag in case of no response (https://github.com/coredns/coredns/pull/4742)
+* plugin/trace: trace plugin can mark traces with error tag (https://github.com/coredns/coredns/pull/4720)