Adding a few more points to the changelog

src/changelog.html

@@ -2,6 +2,7 @@
   <dl>
     <dt>Pending release</dt>
     <dd>Freshened up design</dd>
+    <dd>Multiline regular expression input field (press Shift-Enter to render)</dd>
     <dd>Added a changelog</dd>
     <dd>Added documentation</dd>
     <dd>All parsing and rendering happens client-side</dd>
@@ -9,5 +10,6 @@
     <dd>Added display of regular expression flags (ignore, global, multiline)</dd>
     <dd>Added indicator of quantifier greedy-ness</dd>
     <dd>Various improvements to parsing of regular expression</dd>
+    <dd>Rendering of a regular expression can be canceled by pressing Escape</dd>
   </dl>
 </div>