[libsigc++2] Update README on Visual Studio Builds

[Chun-wei Fan <fanchunwei src gnome org>]

commit d1f35230a8cd65bca221f4aef732b5fdc06951fc
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Sep 9 23:36:47 2015 +0800

    Update README on Visual Studio Builds
    
    Since the Visual Studio project files and the related sources have been
    updated to work with Visual Studio 2013, and that the test programs do
    run well there, update the README file to let people know the situation.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=754082

 README |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/README b/README
index 9e8c954..a773b37 100644
--- a/README
+++ b/README
@@ -49,7 +49,7 @@ Overview of the distribution:
    
    tests/                            programs testing and verifying proper behaviour
    
-   MSVC_Net2010/                     project files for building the library with MSVC++ 2010
+   MSVC_Net2013/                     project files for building the library with MSVC++ 2013
 
 
 Compatibility:
@@ -58,4 +58,4 @@ Compatibility:
 
    All releases are tested with the gcc (g++) compiler.
    Release 2.3.2 has been tested with gcc 4.8.2, clang 3.4 and MS Visual C++ 2010.
-   Release 2.5.1 has been tested with gcc 4.9.2 and clang 3.6.0.
+   Release 2.5.1 has been tested with gcc 4.9.2, clang 3.6.0 and MS Visual C++ 2013.