[gnome-calendar] NEWS: updated for release

[Erick Pérez Castellanos <erickpc src gnome org>]

commit eba5a341bbefbbc1b6864ee9a5e37bdc8b8cda30
Author: Erick Pérez Castellanos <erick red gmail com>
Date:   Tue Dec 23 12:00:56 2014 -0500

    NEWS: updated for release

 NEWS |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)
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+Major changes in 3.15.3:
+* Initial search implementation
+* Month-view reworked
+* Month-view support for overflow of events
+* Month-view has support for RTL locales
+* Month-view has support for multiday events
+* Edit/new dialog reworked to use GtkBuilder UI files
+* Added new time and date selectors
+* Added proper `GtkHeaderBar`
+* Added calendar selector popover for when the dialog is used on event
+* Added calendar selector popover for hide/show calendars on the main window
+* Navigation buttons were relocated and a Today buttong was added
+* Calendar got a new 3d icon