Changed - Move relationships to release python SDK
2.7.0
Added - `fetch_resources` parameter to the relationships `list` and `retrieve_multiple` methods, which attempts to fetch the resource referenced in the relationship.
2.6.4
Fixed - Fixed a bug where 429 was not retried on all endpoints
2.6.3
Fixed - Resource metadata should be able to set empty using `.metadata.set(None)` or `.metadata.set({})`.
2.6.2
Fixed - Asset retrieve subtree should return empty AssetList if asset does not exist.
2.6.1
Added - `geospatial` to list of valid relationship resource types.