Changes to Get CFTC positioning history

the data/period response's property type changed from string to object for status 200

deleted the query request parameter period

removed the optional property data/data/items/value from the response with the 200 status

added the new optional query request parameter commodity

added the new optional query request parameter end_date

added the new optional query request parameter start_date

added the optional property data/coverage to the response with the 200 status

added the optional property data/data/items/open_interest to the response with the 200 status

added the optional property data/data/items/spec_net to the response with the 200 status

added the optional property data/data/items/spec_net_pct_oi to the response with the 200 status

added the optional property data/period/end to the response with the 200 status

added the optional property data/period/start to the response with the 200 status

added the new optional query request parameter period

added the media type application/json for the response with the status 200

added the media type application/json for the response with the status 401

added the non-success response with the status 400

added the non-success response with the status 500