add NEWS entry

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
ClipboardsManager: add a way to sync two clipboards

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
keybinder: add a keybinding to sync the primary to clipboard

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
gpasted: use the new keybinding

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
Merge branch '3.0'

* 3.0:
  gpasted: use the new keybinding
  keybinder: add a keybinding to sync the primary to clipboard
  ClipboardsManager: add a way to sync two clipboards
  add NEWS entry

Conflicts:
	NEWS