add changelog for getMetricsAsArray type fix

CHANGELOG.md

@@ -17,20 +17,21 @@ project adheres to [Semantic Versioning](http://semver.org/).
   causing vscode to think that push/pushAdd and delete didn't promise
   resulting in incorrect behavior.
 
+- changed: `register.clusterMetrics()` no longer accepts a callback; it only
+  returns a promise.
+
 ### Added
 
 ## [14.0.0] - 2021-09-18
 
 ### Breaking
 
+- types: fixed type for `registry.getMetricsAsArray()`
 - changed: `linearBuckets` does not propagate rounding errors anymore.
 
   Fewer bucket bounds will be affected by rounding errors. Histogram bucket
   labels may change. [`6f1f3b2`](https://github.com/siimon/prom-client/commit/6f1f3b24c9c21311ff33e7d4b987b40c6b304e04)
 
-- changed: The push gateway methods `pushAdd()`, `push()` and `delete()` now
-  return Promises instead of accepting a callback:
-
   ```js
   // Old:
   gateway.pushAdd({ jobName: 'test' }, (err, resp, body) => {});