In the previous challenge, we learned about each method being central to all
of the methods provided by Enumerable class. One of such useful methods is
each_with_index which allows you to iterate over items along with an index
keeping count of the item.
As you can note, the counting of items starts from 0.
In this challenge, your task is to complete the skip_animals method that
takes an animals array and a skip integer and returns an array of all elements except first skip number of items as shown in the example below.