Fix Upgrade file version headline (#251)

alexander-schranz · web-flow · commit c890e2851089 · 2023-06-01T16:16:44.000+02:00
diff --git a/UPGRADE.md b/UPGRADE.md
@@ -102,8 +102,6 @@ The `DataMapperInterface` was changed to make it easier to set localized and unl
     ): void;
 ```
 
-## 0.6.x
-
 ### Use jsonb for PostgreSQL json columns
 
 This effects only PostgreSQL databases:
