metajam 0.3.1

Fix some tests that could failed due to the APIs being down.

metajam 0.3.0

• Resubmission to CRAN

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