Caltechdata-api

This release fixes some issues with DOI and other identifier handling.

The caltechdata_edit function was changed so it accepts just one id at a time. This is the more likely use case and makes metadata checks easier.

This release improves metadata handling, add some example metadata files, and updates documentation.

**Full Changelog**: https://github.com/caltechlibrary/caltechdata_api/compare/v1.0.0...v1.1.0

This release of caltechdata_api is the first designed to work with InvenioRDM and the current version of CaltechDATA. The interface is generally the same, but has been enhanced to support the new features in InvenioRDM such as draft records. Code that supported the TIND version of CaltechDATA is no longer needed and has been removed.

**Full Changelog**: https://github.com/caltechlibrary/caltechdata_api/compare/v0.3.0...v1.0.0

This release fixes file handling on edit to correctly remove duplicate files. It also adds better options to edit.py to be able to delete files.

This release adds get_files, which is a simple export of files attached to a record.

This release reorganizes the `get_metadata` function to add a validate option to enable skipping validation and removes an unused password option. It also fixes an issue that impacted records with multiple rights statements.

Have tested and relaxed requirements to allow Python 3.6. Also adds automation to generate a CITATION.cff file.