Update README.md

Author: gridnevvvit

README.md

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 YDB Python SDK
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+[![PyPI version](https://badge.fury.io/py/ydb.svg)](https://badge.fury.io/py/ydb)
+[![Functional tests](https://github.com/ydb-platform/ydb-python-sdk/actions/workflows/tests.yaml/badge.svg)](https://github.com/ydb-platform/ydb-python-sdk/actions/workflows/tests.yaml)
+[![Style checks](https://github.com/ydb-platform/ydb-python-sdk/actions/workflows/style.yaml/badge.svg)](https://github.com/ydb-platform/ydb-python-sdk/actions/workflows/style.yaml)
+
 Officially supported Python client for YDB.