add 'index-only scans' to roadmap

h2/src/docsrc/html/roadmap.html

@@ -578,6 +578,7 @@ See also <a href="build.html#providing_patches">Providing Patches</a>.
 </li><li>Use Java 6 SQLException subclasses.
 </li><li>Issue 390: RUNSCRIPT FROM '...' CONTINUE_ON_ERROR
 </li><li>Use Java 6 exceptions: SQLDataException, SQLSyntaxErrorException, SQLTimeoutException,..
+</li><li>Support index-only when doing selects (i.e. without needing to load the actual table data)
 </li></ul>
 
 <h2>Not Planned</h2>