Going forward we'll use pandoc-citeproc, as an external filter.
The `--bibliography`, `--csl`, and `--citation-abbreviation` fields
have been removed. Instead one must include `bibliography`, `csl`,
or `csl-abbrevs` fields in the document's YAML metadata. The filter
can then be used as follows:
pandoc --filter pandoc-citeproc
The `Text.Pandoc.Biblio` module has been removed. Henceforth,
`Text.CSL.Pandoc` from pandoc-citations can be used by library users.
The Markdown and LaTeX readers now longer format bibliographies and
citations. That must be done using `processCites` or `processCites'`
from Text.CSL.Pandoc.
All bibliography-related fields have been removed from `ReaderOptions`
and `WriterOptions`: `writerBiblioFiles`, `readerReferences`,
`readerCitationStyle`.
API change.