Added temporary asgiref requirement

See #1255
for discussion.

Link to Django 4.1's required `asgiref` version:
https://github.com/django/django/blob/4.1.11/setup.cfg#L42
Link to Django 4.2's required `asgiref` version:
https://github.com/django/django/blob/4.2/setup.cfg#L42

CHANGES.rst

@@ -12,7 +12,8 @@ Unreleased
   (gh-1248)
 - Passing an empty list as the ``fields`` argument to ``bulk_update_with_history()`` is
   now allowed; history records will still be created (gh-1248)
-
+- Added temporary requirement on ``asgiref>=3.6`` while the minimum required Django
+  version is lower than 4.2 (gh-1261)
 
 3.4.0 (2023-08-18)
 ------------------

requirements/test.txt

@@ -1 +1,3 @@
 -r ./coverage.txt
+# DEV: Remove this requirement entirely when the minimum required Django version is 4.2
+asgiref>=3.6

setup.py

@@ -11,6 +11,8 @@
             "fallback_version": "0.0.0",
         },
         setup_requires=["setuptools_scm"],
+        # DEV: Remove `asgiref` when the minimum required Django version is 4.2
+        install_requires=["asgiref>=3.6"],
         description="Store model history and view/revert changes from admin site.",
         long_description="\n".join((readme.read(), changes.read())),
         long_description_content_type="text/x-rst",