style: limit line length to 79 characters

Limited the lengths of all lines to 79 characters (if possible).
Additionally, some other lines were breaked for consistence.

tests/unit/utils/test_human_readable_list.py

@@ -48,7 +48,12 @@ import pytest
     ([1, 2, 3], 'and', '\'', '\'1\', \'2\' and \'3\''),
     ([1, 2, 3], '', '\'', '\'1\', \'2\'  \'3\''),
     ([1, 2, 3, 42, 'a', 23], 'and', '', '1, 2, 3, 42, a and 23'),
-    ([1, 2, 3, 42, 'a', 23], 'and', '\'', '\'1\', \'2\', \'3\', \'42\', \'a\' and \'23\''),
+    (
+        [1, 2, 3, 42, 'a', 23],
+        'and',
+        '\'',
+        '\'1\', \'2\', \'3\', \'42\', \'a\' and \'23\''
+    ),
 ])
 def test_human_readable_list(ls, final_separator, quotation_mark, expected):
     assert human_readable_list(ls, final_separator, quotation_mark) == expected