Update changelog for 4.0.1

[bhrutledge]

This also fixes this error when running tox -e changelog:

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ERROR: tried to import twine, but ran into this error: No module named 'importlib_metadata'
Traceback (most recent call last):
  File "/Users/bhrutledge/Dev/twine/.tox/changelog/lib/python3.8/site-packages/towncrier/_project.py", line 20, in _get_package
    module = import_module(package)
  File "/Users/bhrutledge/.pyenv/versions/3.8.12/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 973, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'twine'