Change release date to include last fixes

Author: fspindle

ChangeLog

@@ -5,7 +5,7 @@
      Copyright (C) 2005 - 2019 by Inria. All rights reserved.
                       https://visp.inria.fr
 
-ViSP 3.2.0 (released January 21, 2019)
+ViSP 3.2.0 (released January 23, 2019)
   - Contributors:
     . This release was possible thanks to contributions from Fabien Spindler,
       Souriya Trinh, Olivier Kermorgant, Mathieu Simon, Francois Chaumette,