Google Ads API is now out of Beta Mode and v0 is all set to release by the end of April. The beta version will soon become inaccessible from the 30th of April 2019.
API users need to update their client libraries in order to use v1 ahead of April 30. Also part form this feature, the Google Ads Query Language also offers more flexible querying.
The updated client libraries and code examples are said to be published by around 6th of March. For this, you need to update the terms and conditions in API center.