Update ex12_findTheOldest README.md

Added clarification to instruct learner to look in test case to understand object structure
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Given an array of objects representing people with a birth and death year, return the oldest person. Given an array of objects representing people with a birth and death year, return the oldest person.
Now that you've reached the end of these exercises, you should be fairly comfortable getting the information you need from test case(s). Take a look at how the array of objects is constructed in this exercise's test cases to help you write your function.
## Hints ## Hints
- You should return the whole person object, but the tests mostly just check to make sure the name is correct. - You should return the whole person object, but the tests mostly just check to make sure the name is correct.
- this can be done with a couple of chained array methods, or by using `reduce`. - This can be done with a couple of chained array methods, or by using `reduce`.
- One of the tests checks for people with no death-date.. use JavaScript's Date function to get their age as of today. - One of the tests checks for people with no death-date.. use JavaScript's Date function to get their age as of today.