CHANGELOG entry about IDNA support

CHANGELOG.md

@@ -1,5 +1,19 @@
 ## v0.9.19 - 2022-??-?? - ???
 
+#### Noteworthy changes
+
+* Added support for automatic handling of IDNA (utf-8) zones. Everything is
+  stored IDNA encoded internally. For ASCII zones that's a noop. For zones with
+  utf-8 chars they will be converted and all internals/providers will see the
+  encoded version and work with it without any knowledge of it having been
+  converted. This means that all providers will automatically support IDNA as of
+  this version. IDNA zones will generally be displayed in the logs in their
+  decoded form. Both forms should be accepted in command line arguments.
+  Providers may need to be updated to display the decoded form in their logs,
+  until then they'd display the IDNA version.
+
+#### Stuff
+
 * Addressed shortcomings with YamlProvider.SUPPORTS in that it didn't include
   dynamically registered types, was a static list that could have drifted over
   time even ignoring 3rd party types.