CHICAGO — Patrick Kane scored two of the Chicago Blackhawks’ four goals in the third period Friday night, but the Colorado Avalanche held on for a 6-4 victory and a season sweep. The Avalanche entered the game at the United Center 18-1-1 in their last 20 games and 9-0-1 in the last 10, and they completed a four-game sweep of the Hawks. The Avs beat the Hawks, 4-2, in the season opener in October and two other times this month: 4-3 in overtime Jan. 4 and 2-0 on Monday in Colorado. After the Hawks fell behind 3-0 in the third, they rallied with goals from Brandon Hagel and Kane 40 seconds apart….
