https://bintray.
https://bintray.com/docs/api.html#_get_attributes
https://bintray.
https://bintray.com/docs/api.html#_delete_attributes
https://bintray.
https://bintray.com/docs/api.html#_set_attributes
https://bintray.
https://bintray.com/docs/api.html#_update_attributes