readme: explicitly state we use ranges in copyright years

Reported by Jack Kelly in automake bug#11356.

* README: Explicitly state we use ranges in copyright years; this is
mandated by the GNU Coding Standards for each package that wants to
actually use ranges in copyright years.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>

diff --git a/README b/README
index d69fbd4..fdf25fa 100644 (file)
--- a/README
+++ b/README
@@ -47,6 +47,9 @@ New releases are announced to autotools-announce@gnu.org.  If you want to
 be informed, subscribe to that list by following the instructions at
 <http://lists.gnu.org/mailman/listinfo/autotools-announce>.
 
+For any copyright year range specified as YYYY-ZZZZ in this package,
+that the range specifies every single year in that closed interval.
+
 -----
 
 Copyright (C) 1994-2012 Free Software Foundation, Inc.