Add notes for next 1.8.0 release (#4143)

Signed-off-by: Miek Gieben <miek@miek.nl>

notes/coredns-1.8.0.md

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++++
+title = "CoreDNS-1.8.0 Release"
+description = "CoreDNS-1.8.0 Release Notes."
+tags = ["Release", "1.8.0", "Notes"]
+release = "1.8.0"
+date = 2020-09-21T10:00:00+00:00
+author = "coredns"
+draft = "yes"
++++
+
+The CoreDNS team has released
+[CoreDNS-1.8.0](https://github.com/coredns/coredns/releases/tag/v1.8.0).
+
+This release add two backwards incompatible changes.
+
+One, because Caddy is now developing a version 2 and we are using version 1 we've internalized Caddy
+into <https://github.com/coredns/caddy>. This means the `caddy` types change and *all* plugins need
+to fix the import path from: `github.com/caddyserver/caddy` to `github.com/coredns/caddy` (this can
+thankfully be automated).
+
+Next the `transfer` plugin is now made a first class citizen and plugins wanting to perform outgoing
+zone transfers can now do so: *file*, *auto*, *secondary* and *kubernetes* are now doing so.
+You'll need to change your Corefile from (e.g.):
+
+``` txt
+example.org {
+    file example.org.signed {
+        transfer to *
+        transfer to 10.240.1.1
+    }
+}
+```
+
+To
+
+``` txt
+example.org {
+    file example.org.signed
+    transfer {
+        to * 10.240.1.1
+    }
+}
+```
+
+## Brought to You By
+
+## Noteworthy Changes
+
+* plugin/transfer: Implement notifies for transfer plugin (https://github.com/coredns/coredns/pull/3972) (#4142)
+* core: Move caddy v1 in our GitHub org (https://github.com/coredns/coredns/pull/4018)