Bump Version from 2.1.0 to 2.1.1 (opensearch-project#318)

Signed-off-by: Theo Truong <theotr@amazon.com>

Signed-off-by: Theo Truong <theotr@amazon.com>

CHANGELOG.md

@@ -3,22 +3,24 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ## [Unreleased]
 ### Added
+### Dependencies
+### Changed
+### Deprecated
+### Removed
+### Fixed
+### Security
+
+## [2.1]
+### Added
 - Github workflow for changelog verification ([#306](https://github.com/opensearch-project/opensearch-js/pull/306))
 - Add GitHub and Jenkins release workflow ([#317](https://github.com/opensearch-project/opensearch-js/pull/317))
+
 ### Dependencies
 - Bumps `tsd` from 0.22.0 to 0.24.1
 - Bumps `semver` from 7.3.7 to 7.3.8
 
-### Changed
-
-### Deprecated
-
-### Removed
-
 ### Fixed
 - Fix mutability of connection headers ([#291](https://github.com/opensearch-project/opensearch-js/issues/291))
 
-### Security
-
-
-[Unreleased]: https://github.com/opensearch-project/opensearch-js/compare/2.0...HEAD
+[2.1]: https://github.com/opensearch-project/opensearch-js/releases/tag/2.1.0
+[Unreleased]: https://github.com/opensearch-project/opensearch-js/compare/2.1...HEAD