Update Changelogs “4-4-1-2019-09-23”

Author: hvhvhcgv

src/content/changelog/4-4-1-2019-09-23.md

@@ -33,6 +33,8 @@ Some heuristics for which heading to put API reference updates under:
 ### Added
 - Added the `Enable Linode Managed` [POST /account/settings/managed-enable]() endpoint which enables Linode Managed for the entire account and sends a welcome email to the account’s associated email address. `Enable Linode Managed` can monitor any service or software stack reachable over TCP or HTTP.
 
+- Added Firewalls beta endpoint [POST /firewalls]() which accepts a firewall setup and creates a new firewall. **Note**: this endpoint is prepended with **`/v4beta`** instead of `/v4`.
+
 ### Changed