Fix Python 3 note

timhoffm · timhoffm · commit b01c12153fc9 · 2018-09-20T23:04:22.000+02:00
diff --git a/doc/_templates/sidebar_announcement.html b/doc/_templates/sidebar_announcement.html
@@ -1,5 +1,5 @@
 <div class="sidebar-announcement">
-  <p>Matplotlib 3.0 Python 3 only.</p>
+  <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>
 </div>
