docs: changelog

CHANGELOG.md

@@ -46,7 +46,40 @@ NOTE: Add new changes BELOW THIS COMMENT.
 
 #### Configuration Changes
 
-In this release, the schema version has changed from 24 to 25.
+In this release, the schema version has changed from 24 to 26.
+
+- Filtering related settings such as `protection_enabled`, `blocking_mode`,
+  `blocking_ipv4`, `blocking_ipv6`, `blocked_response_ttl`,
+  `protection_disabled_until`, `parental_block_host`, `safebrowsing_block_host`
+  have been moved from `dns` section of the YAML configuration file to the new
+  section `filtering`:
+
+  ```yaml
+  # BEFORE:
+  'dns':
+    'protection_enabled':        true,
+    'blocking_mode':             'custom_ip',
+    'blocking_ipv4':             '1.2.3.4',
+    'blocking_ipv6':             '1:2:3::4',
+    'blocked_response_ttl':      10,
+    'protection_disabled_until': 'null',
+    'parental_block_host':       'p.dns.adguard.com',
+    'safebrowsing_block_host':   's.dns.adguard.com'
+
+  # AFTER:
+  'filtering':
+    'protection_enabled':        true,
+    'blocking_mode':             'custom_ip',
+    'blocking_ipv4':             '1.2.3.4',
+    'blocking_ipv6':             '1:2:3::4',
+    'blocked_response_ttl':      10,
+    'protection_disabled_until': 'null',
+    'parental_block_host':       'p.dns.adguard.com',
+    'safebrowsing_block_host':   's.dns.adguard.com',
+  ```
+
+  To rollback this change, remove the new object `filtering`, set back filtering
+  properties in `dns` section, and change the `schema_version` back to `25`.
 
 - Property `debug_pprof` which used to setup profiling HTTP handler, is now
   moved to the new `pprof` object under `http` section.  The new object contains