0.3.1 - 2020-02-26
- Added support for Google Ads API v3_0.
- Added SearchStreamHandler to support the search stream API.
- Added code examples: add_app_campaign, update_campaign_criterion_bid_modifier,
  add_listing_scope.
- Updated code examples get_campaigns and get_keyword_stats to use the search
  stream API.

2.2.0 - 2019-09-16
- Added support for Google Ads API v2_2.
- Added code examples: get_account_hierarchy, add_smart_display_ad, add_prices,
  add_sitelinks, forecast_reach, upload_offline_conversion, etc.

2.1.0 - 2019-08-15
- Added support for Google Ads API v2_1.
- Added examples for campaign experiments and mutate jobs.
- Added OperationService to support long running operations.

2.0.0 - 2019-06-28
- Added support for Google Ads API v2_0.

1.0.0 - 2019-06-24
- Initial release with support for Google Ads API v1_3.