update to latest documentation and update copyright year
diff --git a/coders/pango.h b/coders/pango.h
index 315c91c..9add677 100644
--- a/coders/pango.h
+++ b/coders/pango.h
@@ -1,5 +1,5 @@
 /*
-  Copyright 1999-2020 ImageMagick Studio LLC, a non-profit organization
+  Copyright 1999-2021 ImageMagick Studio LLC, a non-profit organization
   dedicated to making software imaging solutions freely available.
   
   You may not use this file except in compliance with the License.  You may