Integration with AIrsenal

[jack89roberts]

Hi @anguswilliams91 , I finally got round to having a look at this today, and getting some score predictions with ExtendedDixonColesMatchPredictor was really smooth, thanks! 🎉

To get it working in AIrsenal there are 3 functions we use in bpl that are not in bpl-next currently (I think):

• BPLModel.add_new_team
• BPLModel.score_n_probability
• BPLModel.concede_n_probability

I'm happy to help with adding these to bpl-next (to BaseMatchPredictor for the 2nd two?), but may need a hand with add_new_team. We can also implement them on the AIrsenal side instead if you'd prefer not to have them here?

[jack89roberts]

Had a go at the low hanging fruit in #5