Add dependency on asgiref

Will be used for asgiref.local.Local, a context-aware threadlocal.local
replacement also used internally by Django.  Depend on the same version
required by the earliest supported version of Django (3.2).

Author: living180

setup.cfg

@@ -31,6 +31,7 @@ classifiers =
 [options]
 python_requires = >=3.7
 install_requires =
+    asgiref >= 3.3.2, < 4
     Django >= 3.2
     sqlparse >= 0.2.0
 packages = find: