Add changelog entries

index.html

@@ -12609,6 +12609,8 @@ <h2>Change Log</h2>
 		<h2>Substantive changes since the last public working draft</h2>
 		<ul>
 			<!-- EdNote: After each WD publish, move contents of this list into the next one below. -->
+			<li>02-May-2019: Add aria-expanded support to application and checkbox roles.</li>
+			<li>02-May-2019: Remove aria-expanded support from the following roles: alert, alertdialog, article, banner, blockquote, caption, cell, complementary, contentinfo, definition, deletion, dialog, directory, feed, figure, form, grid, group, heading, img, insertion, label, landmark, legend, list, listitem, log, main, marquee, math, menu, menubar, navigation, note, paragraph, radiogroup, region, search, select, status, subscript, superscript, table, tabpanel, term, time, timer, toolbar, tooltip, tree, treegrid.</li>
 			<li>11-Apr-2019: Add legend role</li>
 			<li>11-Apr-2019: Remove children-presentational=true from math role</li>
 			<li>10-Apr-2019: Add label role</li>