[HOTFIX] Citation File Format (CFF) - Core module (CFF-Core) Specifications

Hotfix release of the Citation File Format Core module (CFF-Core) specifications.

File any issues against https://github.com/citation-file-format/citation-file-format/issues please.

CHANGELOG

• Add updated link to collective Zenodo DOI
• Fix citation-file-format/citation-file-format#43
• Add a note about the arbitrary order of keys in the CFF file