Add async to the allowed spellings.

tim-schilling · tim-schilling · commit dc3f80be5cac · 2021-02-12T09:04:45.000-06:00
diff --git a/docs/spelling_wordlist.txt b/docs/spelling_wordlist.txt
@@ -37,3 +37,4 @@ unhashable
 uWSGI
 validator
 Werkzeug
+async
