Added Cosmos release notes (#1693)

Co-authored-by: Kate Olszewska <kaolsze@microsoft.com>

releases/2020-08/python.md

@@ -115,8 +115,11 @@ SearchIndexDocumentBatchingClient supports handling document indexing actions in
 #### Secrets [Changelog](https://github.com/Azure/azure-sdk-for-python/blob/master/sdk/keyvault/azure-keyvault-secrets/CHANGELOG.md#420-2020-08-11)
 #### Certificates [Changelog](https://github.com/Azure/azure-sdk-for-python/blob/master/sdk/keyvault/azure-keyvault-certificates/CHANGELOG.md#420-2020-08-11)
 
+### Cosmos DB [Changelog](https://github.com/Azure/azure-sdk-for-python/blob/master/sdk/cosmos/azure-cosmos/CHANGELOG.md#410-2020-08-10)
+
+- Added deprecation warning for "lazy" indexing mode. The backend no longer allows creating containers with this mode and will set them to consistent instead.
+- Various bug fixes.
 
-### Azure Cosmos DB Python SDK [Changelog](https://github.com/Azure/azure-sdk-for-python/blob/master/sdk/cosmos/azure-cosmos/CHANGELOG.md)
 
 #### New Features