Friday the 13th

Created by Julien Palard

Find the next friday the 13th.

Write a function named friday_the_13th, which takes no parameter, and just returns the date of the next friday the 13th.

If today is a friday the 13th, return it, not the next one.

Return the date as a string of the following format: YYYY-MM-DD.


>>> print(friday_the_13th())