update todo

git-svn-id: https://svn.code.sf.net/p/jackcess/code/jackcess/trunk@809 f203690c-595d-4dc9-a70b-905162fa7fd2

TODO.txt

@@ -25,7 +25,7 @@ Refactor goals:
 - tweak lookup apis (specify column vs column name)
 - clean up javadocs
   - enhance public api classes
-  - add @usage tags to util classes
+  * add @usage tags to util classes
 * change CodecHandler usage to handle not-inline decoding
   - pass filename to CodecHandler, enable pwd callbacks CallbackHandler
   - pass custom context to CodecHandler?