Removed tests against Python 2.7 in github workflows (opensearch-project#421)

Signed-off-by: saimedhi <saimedhi@amazon.com>

Author: saimedhi

.github/workflows/test.yml

@@ -7,7 +7,6 @@ jobs:
     strategy:
       matrix:
         entry:
-          - { os: 'ubuntu-latest', python-version: "2.7" }
           - { os: 'ubuntu-20.04', python-version: "3.5" }
           - { os: 'ubuntu-20.04', python-version: "3.6" }
           - { os: 'ubuntu-latest', python-version: "3.7" }

CHANGELOG.md

@@ -15,6 +15,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Fixed flaky CI tests by replacing httpbin with a simple http_server ([#395](https://github.com/opensearch-project/opensearch-py/pull/395))
 ### Deprecated
 ### Removed
+- Removed tests against Python 2.7 in github workflows ([#421](https://github.com/opensearch-project/opensearch-py/pull/421))
 ### Fixed
 - Fixed import cycle when importing async helpers ([#311](https://github.com/opensearch-project/opensearch-py/pull/311))
 - Fixed userguide for async client ([#340](https://github.com/opensearch-project/opensearch-py/pull/340))