googleAnalyticsR 0.6.0

Add goal management
Add ga_clientid_deletion() function (#168) (renamed from ga_user_deletion())
Let authDropdown return more than just the viewId (#172)
Export segment related classes and implicitly coerce table filters and segments to their appropriate classes in order to improve integration with the ganalytics package.
Add support for dataLastRefreshed and stop caching if its present (e.g. query includes today) (#183)
Export dim_ga4, met_ga4 and order_type_ga4 classes in order to support the complete conversion of ganalytics query objects into googleAnalyticsR API requests.
Fix segments that were not respecting "IMMEDIATELY_PRECEDES" vs "PRECEDES" (thanks @digitos) (#180)
Fix default of pivot groups so they include first column (thanks @gilliganondata) (#107)
Support for creating remarketing audiences (#161)
Support "NdaysAgo" in antisample calls (#209)
Support more than 1000 entries in various management list functions (#174)
Parse management API list responses into data.frames (#194)
Add user management functions such as ga_users_delete, ga_users_update and ga_users_add
Add custom dimension functions ga_custom_vars_create and ga_custom_vars_patch

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