i- Google Ads API v15 release.

- Add configuration option allowing developer token to be ignored.
- Make "impersonation_email" an optional configuration for service accounts.
- Redact PII fields from new LocalServicesLead and LocalServicesLeadConversation in logs.
- Add DMA consent to conversions and Customer Match examples.
- Update enhanced conversions examples to fit with for-leads and for-web workflows.
- Update usage of ProductBiddingCategoryConstant to ProductCategoryConstant in examples.

Remove support for Google Ads API v12.

- Google Ads API v14_1 release,

- Increase maximum version for proto-plus and google-api-core dependencies.
- Remove add_keyword_plan example.
- Add generate_forecast_metrics and generate_historical_metrics examples.
- Add deprecation warning for Python 3.7.

- Google Ads API v14 release.

- Lower minimum version requirement for dependencies:
  - google-api-core
  - googleapis-common-protos
  - proto-plus
  - protobuf.
- Update unit tests to run with lowest-supported Google-maintained dependencies.
- Update upload_conversion_enhancement example with recommended placeholder names.
- Update place_id field to place_ids in add_performance_max_for_travel_goals_campaign example.
- Add add_things_to_do_ad example.
- Remove examples:
  - generate_forecast_metrics
  - generate_historical_metrics
  - get_campaign_criterion_bid_modifier_simulations

- Google Ads API v13_1 release.

- Add Python versions 3.8, 3.9, and 3.10 to list of classifiers.
- Remove restatement functionality from upload_conversion_enhancement example.
- Move examples/hotel_ads to examples/travel
- Update metadata_interceptor tests to dynamically retrieve Python version.

- Remove support for Google Ads API v11.

- Update examples to use recommended example PII.
- Increase maximum support version of google-auth-oauthlib to < 2.0.0.
- Fix bug in add_customer_match_user_list example.
- Add add_dynamic_page_feed_asset example.
- Add add_performance_max_for_travel_goals_campaign example.
- Update create_experiment example to get campaign ID from experiment arm
  response.

- Remove support for Google Ads API v10.

- Google Ads API v13 release.
- Extend version range for proto-plus and google-api-core
- Update add_customer_match_user_list example with more complex user identifiers
- Remove add_expression_rule_user_list example
- Update remarketing examples to use flexible rule user lists
- Update get_ad_group_bid_modifiers example to remove preferred content criteria

Python client library for API v12.

See ChangeLog for details.

- Remove support for Google Ads API v9.

- Added "pb" user agent key/value pair.
- Change validate_text_ad example to use an RSA instead of ETA.
- Rename get_artifact_metadata example to search_for_google_ads_fields.
- Fix various issues in create_experiment example.