Define a function called double_evens, which takes as an argument a list of numbers. complete the function to return a list with every even value in the list doubled. you can either create a new list or return the original list modified. (if you are modifying the existing list you might want to use the enumerate function to get the list indices.) for example, given the input [1,2,4,5], the function should return the list [1,4,8,5].