- Added support for Google Ads API v22.

- Fixed a typo in the BudgetPerDayMinimumErrorDetails.minimum_budget_amount_micros
  field.
- Updated PMax-related examples to remove the use of urlExpansionOptOut.

- Added support for Google Ads API v21.

- Removed support for Google Ads API v18.
- Added code example: add_demand_gen_campaign.
- Updated campaign-related examples to set the containsEuPoliticalAdvertising
field.

Fixed bug in v20 CampaignBudget resource.

- Added support for Google Ads API v20.

- Removed support for Google Ads API v17.

- Added support for Google Ads API v19_1.

- Updated upload_enhanced_conversions_for_leads example to use session attributes.

- Added support for Google Ads API v19.

- Removed support for Google Ads API v16.
- Removed feed-related examples.
- Updated PMax campaign creation examples to use brand guidelines.
- Updated add_shopping_product_ad example to remove usage of enhancedCpc.

- Fixed bug in Google::Ads::GoogleAds::V18::Resources::CampaignBudget.

- Added support for Google Ads API v18.

- Updated example get_all_disapproved_ads to set returnTotalResultsCount
  on new searchSettings request field.

- Added support for Google Ads API v17_1.

- Removed support for Google Ads API v15.

- Added support for Google Ads API v17.

- Updated examples to remove usage of the page size parameter in Search
  requests.