PIL.Image.point() takes an int, not a float (#2284)

* PIL.Image.point() takes an int, not a float

@furkanatesli Trying to remove these warnings from our Travis CI build logs...
https://travis-ci.com/github/TheAlgorithms/Python/builds/178602503#L809

* fixup! Format Python code with psf/black push

* Revert changes to change_brightness.py

* updating DIRECTORY.md

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