DENVER — Joel Kiviranta scored three goals, including twice into an empty net, Nathan MacKinnon notched his third straight two-assist game and the Colorado Avalanche beat the Seattle Kraken 5-2 on Sunday night. In addition to MacKinnon, Mikko Rantanen and Makar had two assists as the Avalanche swept the three-game season series with the Kraken. Takeaways Kraken: Kakko scored his …