Prepare for release.

Author: domdfcoding

repo_helper/configuration/packaging.py

@@ -303,7 +303,7 @@ class use_whey(use_experimental_backend):  # noqa
 	Whether to use `whey <https://whey.readthedocs.io/en/latest/>`_ to build distributions,
 	rather than ``setuptools.build_meta``.
 
-	.. versionadded:: $VERSION
+	.. versionadded:: 2021.3.8
 	"""  # noqa: D400
 
 	dtype = bool

repo_helper/files/ci_cd.py

@@ -591,7 +591,7 @@ def get_bumpversion_filenames(templates: jinja2.Environment) -> Iterable[str]:
 	"""
 	Returns an iterable of filenames to have the version number bumped in.
 
-	.. versionadded:: $VERSION
+	.. versionadded:: 2021.3.8
 
 	:param templates:
 	"""