Moved changes and acks to appendices.

Updated the change log section (although I didn't list the changes since 2018-04-18)

index.html

@@ -1728,11 +1728,11 @@ <h3>Regular Expressions</h3>
         </section>
       </section>
 
-    <section>
+    <section class=appendix>
       <h2 id="changeLog" class="informative">Changes Since the Last Published Version</h2>
-      <p>This document has been extensively revised and rewritten since the <a href="http://www.w3.org/TR/2014/WD-charmod-norm-20140715/Overview.html">Working Draft</a> of 2014-07-15. Please see the <a href="https://github.com/w3c/charmod-norm/commits/gh-pages">github commit log</a> for more details.</p>
+      <p>Changes to this document since the <a href="http://www.w3.org/TR/2014/WD-charmod-norm-20180418/Overview.html">Working Draft</a> of 2018-04-18 are available via the <a href="https://github.com/w3c/charmod-norm/commits/gh-pages">github commit log</a>.</p>
     </section>
-    <section>
+    <section class=appendix>
       <h2 id="Acknowledgements" class="informative">Acknowledgements</h2>
       <!-- EDNOTE: Contributors and commenters are cited here. Please add to the list in order by family name using en-US collation rules while making allowances for the native representation of names :-)  -->
       <p>The W3C Internationalization Working Group and Interest Group, as well as others, provided many comments and suggestions. The Working Group would like to thank: