add changelog for removed newrelic deployments command

Author: hannahramadan

CHANGELOG.md

@@ -19,6 +19,10 @@
 
   The executable file for the agent's CLI has been renamed from `bin/newrelic` to `bin/newrelic_rpm`. This change resolves a name collision with the standalone New Relic CLI tool. [PR#3323](https://github.com/newrelic/newrelic-ruby-agent/pull/3323)
 
+- **Breaking Change: Remove the `newrelic deployments` CLI command**
+
+    The deprecated `newrelic deployments` CLI command has been removed. To track changes and deployments in New Relic, please see our guide to [Change Tracking](https://docs.newrelic.com/docs/change-tracking/change-tracking-introduction/) for a list of available options. [PR#3299](https://github.com/newrelic/newrelic-ruby-agent/pull/3299)
+
 - **Feature: Add argument validation for the `NewRelic::Agent#record_custom_event` API**
 
   The `NewRelic::Agent#record_custom_event` API now raises an `ArgumentError` when an invalid `event_type` is provided. A valid event type must consist only of alphanumeric characters, underscores (`_`), colons (`:`), or spaces (` `). [PR#3319](https://github.com/newrelic/newrelic-ruby-agent/pull/3319)