Merge pull request matplotlib#16651 from hugovk/patch-2

DOC: Change Python 2 note to past tense

Author: tacaswell

doc/_templates/sidebar_announcement.html

@@ -1,5 +1,5 @@
 <div class="sidebar-announcement">
   <p>Matplotlib 3.0 is Python 3 only.</p>
-  <p>For Python 2 support, Matplotlib 2.2.x will be continued as a LTS release
-      and updated with bugfixes until January 1, 2020.</p>
+  <p>Python 2 support has been dropped on January 1, 2020.</p>
+  <p>The last Python 2 compatible release is 2.2.5.</p>
 </div>