YETUS-932. Update copyrights for 2020 (#84)


Signed-off-by: Akira Ajisaka <aajisaka@apache.org>
diff --git a/NOTICE b/NOTICE
index 2b0325f..26005c2 100644
--- a/NOTICE
+++ b/NOTICE
@@ -1,5 +1,5 @@
 Apache Yetus
-Copyright 2008-2019 The Apache Software Foundation
+Copyright 2008-2020 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (https://www.apache.org/).
diff --git a/asf-site-src/source/_footer.html.erb b/asf-site-src/source/_footer.html.erb
index 877884f..c078bcb 100644
--- a/asf-site-src/source/_footer.html.erb
+++ b/asf-site-src/source/_footer.html.erb
@@ -23,7 +23,7 @@
         <div class="row-fluid">
             <div class="span12 text-left">
               <div class="span12">
-                Copyright 2008-2019 <a href="https://www.apache.org/">Apache Software Foundation</a>. Licensed under the <a href="https://www.apache.org/licenses/">Apache License v2.0</a>. Apache Yetus and the Apache feather logo are trademarks of The Apache Software Foundation.
+                Copyright 2008-2020 <a href="https://www.apache.org/">Apache Software Foundation</a>. Licensed under the <a href="https://www.apache.org/licenses/">Apache License v2.0</a>. Apache Yetus and the Apache feather logo are trademarks of The Apache Software Foundation.
               </div>
             </div>