Add CJK friendly emphasis to README

Author: tats-u

README.md

@@ -264,6 +264,7 @@ Comrak additionally supports its own extensions, which are yet to be specced out
 - Underline
 - Spoiler text
 - "Greentext"
+- [CJK friendly emphasis](https://github.com/tats-u/markdown-cjk-feindly)
 
 By default none are enabled; they are individually enabled with each parse by setting the appropriate values in the
 [`ExtensionOptions` struct](https://docs.rs/comrak/latest/comrak/struct.ExtensionOptions.html).