Backport PR #31699: DOC: Update 1.0.1 release notes (#31702)

Co-authored-by: Tom Augspurger <TomAugspurger@users.noreply.github.com>

Author: meeseeksmachine

doc/source/whatsnew/v1.0.1.rst

@@ -1,7 +1,7 @@
 .. _whatsnew_101:
 
-What's new in 1.0.1 (??)
-------------------------
+What's new in 1.0.1 (February 5, 2020)
+--------------------------------------
 
 These are the changes in pandas 1.0.1. See :ref:`release` for a full changelog
 including other versions of pandas.
@@ -74,3 +74,5 @@ Bug fixes
 
 Contributors
 ~~~~~~~~~~~~
+
+.. contributors:: v0.25.3..v1.0.1|HEAD

doc/sphinxext/announce.py

@@ -57,6 +57,16 @@ def get_authors(revision_range):
     pat = "^.*\\t(.*)$"
     lst_release, cur_release = [r.strip() for r in revision_range.split("..")]
 
+    if "|" in cur_release:
+        # e.g. v1.0.1|HEAD
+        maybe_tag, head = cur_release.split("|")
+        assert head == "HEAD"
+        if maybe_tag in this_repo.tags:
+            cur_release = maybe_tag
+        else:
+            cur_release = head
+        revision_range = f"{lst_release}..{cur_release}"
+
     # authors, in current release and previous to current release.
     cur = set(re.findall(pat, this_repo.git.shortlog("-s", revision_range), re.M))
     pre = set(re.findall(pat, this_repo.git.shortlog("-s", lst_release), re.M))

doc/sphinxext/contributors.py

@@ -6,7 +6,13 @@
 
 This will be replaced with a message indicating the number of
 code contributors and commits, and then list each contributor
-individually.
+individually. For development versions (before a tag is available)
+use::
+
+    .. contributors:: v0.23.0..v0.23.1|HEAD
+
+While the v0.23.1 tag does not exist, that will use the HEAD of the
+branch as the end of the revision range.
 """
 from announce import build_components
 from docutils import nodes