[nagios-plugins] README: Clarify license notice

[Git Repository]

 Module: nagios-plugins
 Branch: maint
 Commit: 86abb77695be0b6e592afa0c507e2012493d5619
 Author: Holger Weiss <holger at zedat.fu-berlin.de>
   Date: Tue Nov  5 21:15:47 2013 +0100
    URL: https://www.nagios-plugins.org/repositories/nagios-plugins/commit/?id=86abb77

README: Clarify license notice

Note that we permit redistribution and modification under the terms of
future GPL versions, and state the exclusion of warranty.  This is in
accordance with the license notices at the top of our source files.

---

 README | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/README b/README
index 0f0490e..84e5643 100644
--- a/README
+++ b/README
@@ -79,11 +79,18 @@ That's it!  If you have any problems or questions, feel free to send an
 email to <help at nagios-plugins.org>.
 
 
-License Stuff
--------------
+License Notice
+--------------
 
-This software is released under the GNU General Public License, Version 3,
-with the additional exemption that compiling, linking and/or using OpenSSL
-is allowed.
+You can redistribute and/or modify this software under the terms of the GNU
+General Public License as published by the Free Software Foundation; either
+version 3 of the License, or (at your option) any later version; with the
+additional exemption that compiling, linking, and/or using OpenSSL is
+allowed.
 
-See the `COPYING` file for the complete GPLv3 text.
+This software is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.
+
+See the `COPYING` file for the complete text of the GNU General Public
+License, version 3.