Migrating from v1 to v2

Changes to Services and their Components
AdGroupAdService	Introduced `companion_banner` in `VideoBumperInStreamAdInfo` and `VideoNonSkippableInStreamAdInfo`. Note that this is a breaking change for some as this introduced a new field in an empty object.
CampaignService	Renamed `LOCATION_OF_PRESENCE` to `LOCATION` in `NegativeGeoTargetType` and `PositiveGeoTargetType`.
CampaignService	Updated the Campaign `GeoTargetTypeSetting` to default to `PRESENCE_OR_INTEREST` for `NegativeGeoTargetType` and `PositiveGeoTargetType`.
ExtensionFeedItemService	Removed review extensions by removing `ExtensionType REVIEW`. This was already deprecated in AdWords API.
FeedItemService	Introduced `PlaceholderType`, and renamed `FeedItemPlaceholderPolicyInfo.placeholder_type` to `placeholder_type_enum`, using an enum rather than an integer.
GeographicView	Replaced `country_geo_target_constant` with `country_criterion_id` in `GeographicView`.
GoogleAdsFieldService	Set an error on the limit. The page size that can be passed in must be 1 to 10,000 inclusive. Any other number now results in an `INVALID_PAGE_SIZE` error.
GoogleAdsService	Removed: `metrics.average_position` `metrics.impression_reach` For other available metrics, refer to this blog post.
GoogleAdsService	Updated `segments.click_type` to NOT be compatible with: `metrics.view_through_conversions`

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Last updated August 13, 2019.