docs: add changelog note for root => UID 0 change

Author: tylerjl

CHANGELOG.md

@@ -8,6 +8,7 @@
 * Permissions on the Elasticsearch plugin directory have been fixed to permit world read rights.
 * The service systemd unit now `Wants=` a network target to fix bootup parallelization problems.
 * Recursively create the logdir for elasticsearch when creating multiple instances
+* Files and directories with root ownership now specify UID/GID 0 instead to improve compatability with *BSDs.
 
 #### Changes
 * The `api_ca_file` and `api_ca_path` parameters have been added to support custom CA bundles for API access.