Compatible with the new version of dataone (2.3.0) and fix a bug when
the metadata was returning NULL as a value (see
https://stackoverflow.com/questions/79869850/why-does-is-nanull-returns-logical0-and-not-false)
Fix some tests that could failed due to the APIs being down.
New features
- Added support of ISO metadata
Minor fixes
- updated the author list to acknowledge new contributions
- updated maintainer email since metajam was removed from CRAN due to
former email being slowly decommissioned
https://cran.r-project.org/web/packages/metajam/index.html