update changelog

Author: jjallaire

changelog.md

@@ -4,10 +4,18 @@
 - Refine over-detection of Jupyter shell magics (which prevented kernel daemonization)
 - Use on-disk cache for filtered jupyter notebooks
 
+## Knitr
+
+- Correct handling of `knitr::include_graphics()` within inline expressions.
+
 ## References
 
 - Support for `nocite` within \_project.yml for book projects (#1660)
 
+## Crossrefs
+
+- Use 'Appendix' as prefix for references to chapters in appendix
+
 ## OJS
 
 - Better handle OJS code blocks that begin with empty lines