change the maximum pokemon level to 40

[Rplus]

ref: https://pokemongo.gamepress.gg/pokemon-stats-advanced

[vinnymac]

@Rplus read the bottom of this article from the same site https://pokemongo.gamepress.gg/power-up-costs

Pretty sure 40.5 is technically correct based on the game master json.

I.e. Trainer Level = 39 A Single Power Up = .5 Max Pokemon Level = Trainer Level + 1.5 ≈ 40.5