README:  update (C) entry

There are tools that automatically extract this information, so better
make it up to date.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/README b/README
index 9d713e8..4343057 100644
--- a/README
+++ b/README
@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2000 - 2011
+# (C) Copyright 2000 - 2012
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this