add warning about sections that have not been updated

Phil Varner · Phil Varner · commit 86ffbbaf2b31 · 2022-12-12T09:56:21.000-05:00
diff --git a/README.md b/README.md
@@ -103,7 +103,9 @@ interval_day, interval_hour, interval_minute, interval_second
 | from            | numeric        | all               | |
 | to              | numeric        | all               | |
 
-## Aggregation Types
+## Aggregation Types (TBD)
+
+This section has not been updated to match the previous definitions.
 
 ### Single Value Aggregation
 
