Add support for prediction? about glicko2js HOT 3 CLOSED

Could you elaborate on how it's different to the E() function? In Glicko-1 for example, Glickman explicity gave us a function for predicting game outcomes, which was literally just Glicko-1's E() function except instad of taking just the opponent's RD into account, the function uses sqrt(RD²+RDj²). Perhaps a similar modication to Glicko-2's E() function would suffice for this issue?

Also I'm not sure if this repo is still actively maintained, there's a recent change to Glicko-2 that hasn't been implemented here yet.

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@LordVertice thanks for letting me know about the change in the algorithm, I updated the code accordingly.

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Thanks @MarianoMolina & @LordVertice , I implemented your suggestion ( both of you describe the same calculation).
You can now get the probability of player1 to win against player2 with glicko.predict(player1, player2) or player1.predict(player2)

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