routing: drop default f_path for changelog_file_home There is no point in creating a changelog_file_home URL without specifying f_path. The default value of None is thus never any good. And especially, it is unclear what a value of None really means.

pytest >= 4.6.6, < 4.7
pytest-sugar >= 0.9.2, < 0.10
pytest-benchmark >= 3.2.2, < 3.3
pytest-localserver >= 0.5.0, < 0.6
mock >= 3.0.0, < 3.1
Sphinx >= 1.8.0, < 1.9
WebTest >= 2.0.3, < 2.1
isort == 4.3.21