Fix long line, tests (#2123)

* Fix long line

* updating DIRECTORY.md

* Add doctest

* ...

* ...

* Update tabu_search.py

* space

* Fix doctest

    >>> find_neighborhood(['a','c','b','d','e','a'])  # doctest: +NORMALIZE_WHITESPACE
    [['a','e','b','d','c','a',90], [['a','c','d','b','e','a',90],
     ['a','d','b','c','e','a',93], ['a','c','b','e','d','a',102],
     ['a','c','e','d','b','a',113], ['a','b','c','d','e','a',93]]

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Co-authored-by: John Law <johnlaw.po@gmail.com>

digital_image_processing/resize/resize.py

@@ -50,7 +50,7 @@ class NearestNeighbour:
         :param y: Destination X coordinate
         :return: Parent X coordinate based on `y ratio`
         >>> nn = NearestNeighbour(imread("digital_image_processing/image_data/lena.jpg",
-                                         1), 100, 100)
+        ...                              1), 100, 100)
         >>> nn.ratio_y = 0.5
         >>> nn.get_y(4)
         2