NEWS: fix duplicated version number. "2.2.2" is correct instead of 2.2.1.
NEWS: fix duplicated version number. "2.2.2" is correct instead of 2.2.1.

kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2