update changelog

Author: jjallaire

news/changelog-1.3.md

@@ -10,6 +10,7 @@
 - Fix output of code cells that contain triple backticks (or more) ([#3179](https://github.com/quarto-dev/quarto-cli/issues/3179)).
 - Don't install SIGCHLD signal handler since it interferes with IJulia in Julia 1.8.4 and greater ([#2539](https://github.com/quarto-dev/quarto-cli/issues/2539)).
 - Resolve full path to QUARTO_PYTHON binary
+- Improve handling of YAML and titles in notebooks (auto-merge heading based title with YAML front matter)
 
 ## Knitr engine