Implement models' methods

[yoonthegoon]

For each model under src/OpenSkill/Models, they have unimplemented methods drawProbability, winProbabilities, and rate.

drawProbability :: m -> Match -> Double
winProbabilities :: m -> Match -> [Double]
rate :: m -> Match -> Match

drawProbability - Probability that result of the match is a draw. winProbabilites - List of probabilities that given team will win the match. rate - New strengths of players given rating of match is ordered best to worst.

Checklist:

• [ ] BradleyTerryFull
  • [ ] drawProbability
  • [ ] winProbabilities
  • [x] rate
• [ ] BradleyTerryPart
  • [ ] drawProbability
  • [ ] winProbabilities
  • [ ] rate
• [ ] PlackettLuce
  • [ ] drawProbability
  • [ ] winProbabilities
  • [ ] rate
• [ ] ThurstoneMostellerFull
  • [ ] drawProbability
  • [ ] winProbabilities
  • [x] rate
• [ ] ThurstoneMostellerPart
  • [ ] drawProbability
  • [ ] winProbabilities
  • [ ] rate

Once this is done, it will likely be a major release, bumping the version to 1.0.0.0.

[yoonthegoon]

rate now of form

rate :: m -> [Team] -> [Int] -> [Team]