Fix style linter

api/funkwhale_api/instance/views.py

@@ -51,7 +51,7 @@ class NodeInfo(views.APIView):
         try:
             data = nodeinfo.get()
         except ValueError:
-            logger.warn('nodeinfo returned invalid json')
+            logger.warn("nodeinfo returned invalid json")
             data = {}
         return Response(data, status=200, content_type=NODEINFO_2_CONTENT_TYPE)