move seeds dir

streams/json_encoder.py

@@ -0,0 +1,11 @@
+import json
+
+
+class SetEncoder(json.JSONEncoder):
+    def default(self, o):
+        if isinstance(o, set):
+            return list(o)
+        return super(__class__, self).default(o)
+
+
+class JSONEncoder(SetEncoder): ...