Update README.md

Author: AmsterGet

README.md

@@ -87,6 +87,8 @@ The following options can be overridden using ENVIRONMENT variables:
 The client supports an asynchronous reporting (via the ReportPortal asynchronous API).
 If you want the client to report through the asynchronous API, change `v1` to `v2` in the `endpoint` address.
 
+*Note:* It is highly recommended to use the `v2` endpoint for reporting, especially for extensive test suites.
+
 ## Reporting
 
 When organizing tests, specify titles for `test.describe` blocks, as this is necessary to build the correct structure of reports.