Klingon: Provide a more accurate Copyright notice.

README.md

@@ -183,3 +183,6 @@ licensed under the [Unicode Terms of Use](COPYING.UCD). These data files are
 used in their unmodified form. They have the following Copyright notice:
 
     Copyright © 1991-2014 Unicode, Inc. All rights reserved.
+
+The files in `data/csur` are based on the information from the ConScript
+Unicode Registry maintained by John Cowan and Michael Everson.

data/csur/Klingon.txt

@@ -1,5 +1,14 @@
 # Code Point ; Script ; General Category ; Name ; Okrand Transliteration
 #
+# ConScript Unicode Registry
+# Registered: 1996-05-09
+# Updated:    2004-01-15
+#
+# Based on the original encoding by H. Peter Anvin
+# Copyright (C) 2006 Michael Everson
+# Copyright (C) 2012-2014 Reece H. Dunn
+#
+# Reference: Documentation/unicode.txt [Linux Kernel sources]
 # Reference: http://www.evertype.com/standards/csur/klingon.html
 
 F8D0;Qaak;Lo;KLINGON LETTER A;a