Update to add diff mode in release

Author: jackycute

release.sh

@@ -48,6 +48,7 @@ mode/htmlmixed/htmlmixed.js \
 mode/htmlembedded/htmlembedded.js \
 mode/clike/clike.js \
 mode/clojure/clojure.js \
+mode/diff/diff.js \
 mode/ruby/ruby.js \
 mode/python/python.js \
 mode/shell/shell.js \