VANCOUVER, British Columbia — Nathan MacKinnon scored his second goal of the game 27 seconds into overtime, lifting the Colorado Avalanche to a 5-4 victory over the Vancouver Canucks on Saturday night. MacKinnon used his speed to go around a Canucks defender and scored on goalie Thatcher Demko’s blocker side. Andre Burakovsky had a goal and an assist, and Nazem Kadri and Pierre-Edouard Bellemare also scored to help the Avalanche improve to 4-1-0 in their last five games.