Pull request: all: update changelog

Merge in DNS/adguard-home from update-docs to master

Squashed commit of the following:

commit 177ce52
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Nov 27 16:45:44 2020 +0300

    all: update changelog

CHANGELOG.md

@@ -15,9 +15,12 @@ and this project adheres to
 
 ### Added
 
+- A 5 second wait period until a DHCP server's network interface gets an IP
+  address [#2304].
 - `$dnstype` modifier for filters [#2337].
 - HTTP API request body size limit [#2305].
 
+[#2304]: https://github.com/AdguardTeam/AdGuardHome/issues/2304
 [#2305]: https://github.com/AdguardTeam/AdGuardHome/issues/2305
 [#2337]: https://github.com/AdguardTeam/AdGuardHome/issues/2337