update changelog with latest changes

Author: Release bot

CHANGELOG.md

@@ -4,6 +4,13 @@
 <a name="unreleased"></a>
 # Unreleased
 
+## Features
+
+* **metrics:** add EphemeralMetrics as a non-singleton option ([#1676](https://github.com/awslabs/aws-lambda-powertools-python/issues/1676))
+
+
+<a name="v2.1.0"></a>
+## [v2.1.0] - 2022-10-31
 ## Bug Fixes
 
 * **ci:** linting issues after flake8-blackbear,mypy upgrades
@@ -30,6 +37,7 @@
 
 ## Maintenance
 
+* update v2 layer ARN on documentation
 * **ci:** fix typo on version description
 * **deps:** bump peaceiris/actions-gh-pages from 3.8.0 to 3.9.0 ([#1649](https://github.com/awslabs/aws-lambda-powertools-python/issues/1649))
 * **deps:** bump docker/setup-qemu-action from 2.0.0 to 2.1.0 ([#1627](https://github.com/awslabs/aws-lambda-powertools-python/issues/1627))
@@ -2531,7 +2539,8 @@
 * Merge pull request [#5](https://github.com/awslabs/aws-lambda-powertools-python/issues/5) from jfuss/feat/python38
 
 
-[Unreleased]: https://github.com/awslabs/aws-lambda-powertools-python/compare/v2.0.0...HEAD
+[Unreleased]: https://github.com/awslabs/aws-lambda-powertools-python/compare/v2.1.0...HEAD
+[v2.1.0]: https://github.com/awslabs/aws-lambda-powertools-python/compare/v2.0.0...v2.1.0
 [v2.0.0]: https://github.com/awslabs/aws-lambda-powertools-python/compare/v1.31.1...v2.0.0
 [v1.31.1]: https://github.com/awslabs/aws-lambda-powertools-python/compare/v1.31.0...v1.31.1
 [v1.31.0]: https://github.com/awslabs/aws-lambda-powertools-python/compare/v1.30.0...v1.31.0