Better error handling if credentials are incorrect

[Kjeldgaard]

Currently the output is

2022-10-12 18:42:41 INFO fantasy_stats.py:36: Getting League data: Started
Traceback (most recent call last):
  File "/mnt/c/projects/FantasyStats/main.py", line 154, in <module>
    main(**vars(args))
  File "/mnt/c/projects/FantasyStats/main.py", line 54, in main
    fantasy_stats = FantasyStats(
  File "/mnt/c/projects/FantasyStats/fantasy_stats.py", line 37, in __init__
    self.league = League(league_id=league_id, year=year, espn_s2=espn_s2, swid=swid)
  File "/mnt/c/projects/FantasyStats/.venv/lib/python3.10/site-packages/espn_api/football/league.py", line 23, in __init__
    self.fetch_league()
  File "/mnt/c/projects/FantasyStats/.venv/lib/python3.10/site-packages/espn_api/football/league.py", line 26, in fetch_league
    self._fetch_league()
  File "/mnt/c/projects/FantasyStats/.venv/lib/python3.10/site-packages/espn_api/football/league.py", line 29, in _fetch_league
    data = super()._fetch_league()
  File "/mnt/c/projects/FantasyStats/.venv/lib/python3.10/site-packages/espn_api/base_league.py", line 30, in _fetch_league
    data = self.espn_request.get_league()
  File "/mnt/c/projects/FantasyStats/.venv/lib/python3.10/site-packages/espn_api/requests/espn_requests.py", line 74, in get_league
    data = self.league_get(params=params)
  File "/mnt/c/projects/FantasyStats/.venv/lib/python3.10/site-packages/espn_api/requests/espn_requests.py", line 54, in league_get
    checkRequestStatus(r.status_code, cookies=self.cookies, league_id=self.league_id)
  File "/mnt/c/projects/FantasyStats/.venv/lib/python3.10/site-packages/espn_api/requests/espn_requests.py", line 25, in checkRequestStatus
    raise ESPNAccessDenied(f"League {league_id} cannot be accessed with swid={cookies.get('espn_s2')} and swid={cookies.get('SWID')}")
espn_api.requests.espn_requests.ESPNAccessDenied: League 123456 cannot be accessed with swid=123456