Merge pull request #6949 from TheThingsNetwork/fix/account-search-changelog

Add `complement_collaborators` entry to the CHANGELOG

Author: nicholaspcr

CHANGELOG.md

@@ -12,6 +12,7 @@ For details about compatibility between different releases, see the **Commitment
 ### Added
 
 - Option to store rate limits in Redis. When used, the rate limits are applied over the entire cluster instead of per-instance.
+- Field `complement_collaborators` was added to `SearchAccounts`. Allows an user to request the accounts that are not already attached to the entity's collaborator list.
 
 ### Changed