update todo

Author: sergeyt

README.md

@@ -3,6 +3,8 @@ React component to display unified diffs.
 
 ## TODO
 * [x] support unified diff
+* [x] highlight code with prism.js
 * [ ] fix parse-diff to support single patch (e.g. fetched from github) without diff header
 * [ ] split view
 * [ ] github styles
+* [ ] allow to customize highlight function