Handle bye weeks in string representation

If you print a matchup object where there is a bye week, it fails with an error because there is no away team.

espn_api/football/matchup.py

@@ -11,7 +11,11 @@ def __init__(self, data):
         self.away_team: Team
 
     def __repr__(self):
-        return f'Matchup({self.home_team}, {self.away_team})'
+        if hasattr(self, 'away_team'):
+            return f'Matchup({self.home_team}, {self.away_team})'
+        else:
+            return f'Matchup({self.home_team}, N/A)'
+
 
     def _fetch_matchup_info(self, data, team):
         '''Fetch info for matchup'''