[niepce] Update the Gtk requirements

[Hubert Figuière <hub src gnome org>]

commit b9fe7d489e5347ca17ff54c1b60ab222ba258433
Author: Hubert Figuière <hub figuiere net>
Date:   Wed Jul 30 11:42:43 2014 +0200

    Update the Gtk requirements

 README |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/README b/README
index f523f2b..8bf40d9 100644
--- a/README
+++ b/README
@@ -3,9 +3,9 @@ Niepce Digital
 
 This software is licensed under GPL version 3. See file
 COPYING for details.
-Some files maybe under GPL version 2 or later.
+Some files may be under GPL version 2 or later.
 
-(c) 2006-2013 Hubert Figuière
+(c) 2006-2014 Hubert Figuière
 Some portions are written by other people.
 
 What is this?
@@ -19,10 +19,10 @@ To build is you need the following:
 -----------------------------------
 
 A C++11 compiler
-gtk+ 3.2
+gtk+ 3.12
 cairo 1.1
 glibmm 2.32
-gtkmm 3.2
+gtkmm 3.12
 giomm
 cairomm
 cluttermm 1.0