Update maintenance-table.md

Author: MarcoFalke

_includes/posts/maintenance-table.md

@@ -1,6 +1,6 @@
-| 0.17 | 2018-10-03 | 2019-11-24  | 2020-08-01 |
 | 0.18 | 2019-05-02 | 2020-06-03  | 2021-02-01 |
 | 0.19 | 2019-11-24 | 2021-01-15  | 2021-08-01 |
-| 0.20 | 2020-06-03 | after v22.0 | TBA        |
+| 0.20 | 2020-06-03 | 2021-09-13  | 2022-02-01 |
 | 0.21 | 2021-01-15 | after v23.0 | TBA        |
-| 22.0 | TBA*       | TBA         | TBA        |
+| 22.0 | 2021-09-13 | after v24.0 | TBA        |
+| 23.0 | TBA*       | TBA         | TBA        |