Updating changelog to include released changes. Adding skip-changelog tag (opensearch-project#249)

Signed-off-by: Harsha Vamsi Kalluri <harshavamsi096@gmail.com>

Signed-off-by: Harsha Vamsi Kalluri <harshavamsi096@gmail.com>

Author: harshavamsi

.github/workflows/changelog_verifier.yml

@@ -15,4 +15,4 @@ jobs:
 
       - uses: dangoslen/changelog-enforcer@v3
         with:
-          skipLabels: "autocut"
+          skipLabels: "autocut, skip-changelog"

CHANGELOG.md

@@ -3,6 +3,17 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ## [Unreleased]
 ### Added
+### Changed
+### Deprecated
+
+### Removed
+
+### Fixed
+
+### Security
+
+## [2.0.1]
+### Added
 - Added Point in time API rest API([#191](https://github.com/opensearch-project/opensearch-py/pull/191))
 - Added pool_maxsize for RequestsHttpConnection ([#216](https://github.com/opensearch-project/opensearch-py/pull/216))
 - Github workflow for changelog verification ([#218](https://github.com/opensearch-project/opensearch-py/pull/218))
@@ -24,3 +35,4 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 
 [Unreleased]: https://github.com/opensearch-project/opensearch-py/compare/2.0...HEAD
+[2.0.1]: https://github.com/opensearch-project/opensearch-py/compare/2.0...HEAD