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* BREAKING CHANGE for BulkAdGroupCustomAudienceAssociation, BulkAdGroupInMarketAudienceAssociation, BulkAdGroupNegativeCustomAudienceAssociation, BulkAdGroupNegativeInMarketAudienceAssociation, BulkAdGroupNegativeProductAudienceAssociation, BulkAdGroupNegativeRemarketingListAssociation, BulkAdGroupNegativeSimilarRemarketingListAssociation, BulkAdGroupProductAudienceAssociation, BulkAdGroupRemarketingListAssociation, and BulkAdGroupSimilarRemarketingListAssociation: Replaced custom_audience_name, in_market_audience_name, product_audience_name, remarketing_list_name, and similar_remarketing_list_name with audience_name. The audience_name property is now used to map from the 'Audience Name' field of a Bulk file via all audience association SDK objects.
* Updated service proxies to reflect recent interface changes. For details please see the release notes: https://docs.microsoft.com/en-us/bingads/guides/release-notes.
* Added Bulk mapping for responsive ad images i.e., added Images to the existing BulkResponsiveAd.
* Added Bulk mapping for campaign target setting i.e., added TargetSetting to the existing BulkCampaign.
* Added Bulk mapping for campaign level audience associations i.e.,BulkCampaignCustomAudienceAssociation, BulkCampaignInMarketAudienceAssociation, BulkCampaignNegativeCustomAudienceAssociation, BulkCampaignNegativeInMarketAudienceAssociation, BulkCampaignNegativeProductAudienceAssociation, BulkCampaignNegativeRemarketingListAssociation, BulkCampaignNegativeSimilarRemarketingListAssociation, BulkCampaignProductAudienceAssociation, BulkCampaignRemarketingListAssociation, and BulkCampaignSimilarRemarketingListAssociation.
* Added the get_response_header method in class ServiceClient, to access the service TrackingId, etc per GitHub issue https://github.com/BingAds/BingAds-Python-SDK/issues/106.