Add a py.typed marker file for PEP 561 compliance

pgjones · pgjones · commit 4ea4fe53f46f · 2021-01-23T14:33:21.000Z
This allows the new type hints for the ASGI scopes and messages to be
used. Without this mypy ignores anything from asgiref.
diff --git a/MANIFEST.in b/MANIFEST.in
@@ -1,2 +1,3 @@
 include LICENSE
+include asgiref/py.typed
 recursive-include tests *.py
diff --git a/asgiref/py.typed b/asgiref/py.typed
@@ -0,0 +1 @@
+Marker
