changelog & isort

changelog.d/4279.bugfix

@@ -0,0 +1 @@
+Send CORS headers for /media/config

synapse/rest/media/v1/config_resource.py

@@ -18,7 +18,11 @@ from twisted.internet import defer
 from twisted.web.resource import Resource
 from twisted.web.server import NOT_DONE_YET
 
-from synapse.http.server import respond_with_json, wrap_json_request_handler, set_cors_headers
+from synapse.http.server import (
+    respond_with_json,
+    set_cors_headers,
+    wrap_json_request_handler,
+)
 
 
 class MediaConfigResource(Resource):