Hande 'annote' field in bibtex/biblatex writer.

Closes #7266.

src/Text/Pandoc/Citeproc/BibTeX.hs

@@ -156,6 +156,7 @@ writeBibtexString opts variant mblang ref =
            , "langid"
            , "abstract"
            , "keywords"
+           , "annote"
            ]
       Bibtex ->
            [ "author"
@@ -175,6 +176,7 @@ writeBibtexString opts variant mblang ref =
            , "address"
            , "type"
            , "note"
+           , "annote"
            ]
 
   valToInlines (TextVal t) = B.text t

test/command/7266.md

@@ -0,0 +1,10 @@
+```
+% pandoc -f biblatex -t biblatex -s
+@article{id,
+  annote = "annotation"
+}
+^D
+@article{id,
+  annote = {annotation}
+}
+```