Update CHANGELOG.md

Author: brandonc

CHANGELOG.md

@@ -1,8 +1,15 @@
 # UNRELEASED
 
+## Deprecations
+* The `Sourceable` field has been deprecated on `RunTrigger`. Instead, use `SourceableChoice` to locate the non-empty field representing the actual sourceable value by @brandonc [#816](https://github.com/hashicorp/go-tfe/pull/816)
+
 ## Bug Fixes
 * Removed unused field `AgentPoolID` from the Workspace model. (Callers should be using the `AgentPool` relation instead) by @brandonc [#815](https://github.com/hashicorp/go-tfe/pull/815)
 
+## Features
+* Adds `LockedBy` relationship field to `Workspace` by @brandonc [#816](https://github.com/hashicorp/go-tfe/pull/816)
+* Adds `CreatedBy` relationship field to `TeamToken`, `UserToken`, and `OrganizationToken` by @brandonc [#816](https://github.com/hashicorp/go-tfe/pull/816)
+
 # v1.39.2
 
 ## Bug Fixes