top_scorer(scores) that takes a dict mapping player names to integer scores and returns the name of the player with the highest score. Assume scores are unique.top_scorer({'Ravi': 42, 'Meera': 88, 'Sam': 55})'Meera'
Meera has the highest score, 88.
`max(scores, key=scores.get)` returns the key with the largest value.