Update changelog

CHANGELOG.asciidoc

@@ -64,6 +64,7 @@ https://github.com/elastic/beats/compare/v5.1.1...master[Check the HEAD diff]
 - Files created by Beats (logs, registry, file output) will have 0600 permissions. {pull}3387[3387].
 - RPM/deb packages will now install the config file with 0600 permissions. {pull}3382[3382]
 - Add the option to pass custom HTTP headers to the Elasticsearch output. {pull}3400[3400]
+- Unify `regexp` and `contains` conditionals, for both to support array of strings and convert numbers to strings if required. {pull}3469[3469]
 
 *Metricbeat*
 
@@ -87,6 +88,7 @@ https://github.com/elastic/beats/compare/v5.1.1...master[Check the HEAD diff]
 - Kafka consumer groups metricset. {pull}3240[3240]
 - Add dynamic configuration reloading for modules. {pull}3281[3281]
 - Add docker health metricset {pull}3357[3357]
+- System module uses new matchers for white-listing processes. {pull}3469[3469]
 
 *Packetbeat*
 
@@ -96,6 +98,7 @@ https://github.com/elastic/beats/compare/v5.1.1...master[Check the HEAD diff]
 - Add enabled config option to prospectors. {pull}3157[3157]
 - Add target option for decoded_json_field. {pull}3169[3169]
 - Add the `pipeline` config option at the prospector level, for configuring the Ingest Node pipeline ID. {pull}3433[3433]
+- Update regular expressions used for matching file names or lines (multiline, include/exclude functionality) to new matchers improving performance of simple string matches. {pull}3469[3469]
 
 *Winlogbeat*