v1 has reached it's EOL. Please migrate to v2.

I just attempted to make my first script using your library (and I must say it did look very promising in terms of simplicity), however, it seems like football-data.org have updated their API and the version used here is no longer supported. I don't know how large the changes are, but when attempting to print the PL league table the program will crash and when debugging I notice that the local table variable that's being passed to the Table class (line 120 in football.py) contains the following data: {'message': "v1 has reached it's EOL. Please migrate to v2.", 'errorCode': 410}

Other, minor, errors I've noticed:

Dependency on the library prettytable is not automatically handled by pip install and has to be installed manually

passing the api_key variable to initialize a Football object does not work unless the environment variable is already set:

line 34, in __init__,
"FOOTBALL_API_KEY environment variable not set or no "
ValueError: FOOTBALL_API_KEY environment variable not set or no API key given.

The last bulletpoint was caused by this code:

from credentials import my_credentials
from football import Football 

football = Football(my_credentials['token'])

amosbastian / football

v1 has reached it's EOL. Please migrate to v2. #8