Improve PokèAPI example

## Improve PokèAPI example
Current we have the [PokèAPI example](https://github.com/scanapi/examples/tree/master/pokeapi), but it only specifies two requests: `https://pokeapi.co/api/v2/pokemon` and `https://pokeapi.co/api/v2/${pokemon_name}`. It would be nice to have more requests specified.

[PokèAPI API documentation](https://pokeapi.co/docs/v2) 