Update KEP-20 status (#1415)

Signed-off-by: Aleksey Dukhovniy <alex.dukhovniy@googlemail.com>

keps/0020-manual-plan-execution.md

@@ -8,8 +8,8 @@ owners:
   - "@alenkacz"
   - "@zen-dog"
 creation-date: 2019-11-08
-last-updated: 2020-01-20
-status: provisional
+last-updated: 2020-03-10
+status: implemented
 see-also:
   - KEP-18
 ---

keps/README.md

@@ -24,7 +24,7 @@
 | [0017 - Pipe Tasks](0017-pipe-tasks.md) | provisional | Feature for a mechanism that allows piping of resources (files) from one task to another |
 | [0018 - Controller redesign](0018-controller-overhaul.md) | implementable | Refactoring of KUDO controller |
 | [0019 - Versioning of Operator Packages](0019-package-api-versioning.md) | implementable | Connection between the different versions that describe an operator |
-| [0020 - Manual plan execution](0020-manual-plan-execution.md) | provisional |  |
+| [0020 - Manual plan execution](0020-manual-plan-execution.md) | implemented |  |
 | [0023 - Enabling and Disabling features in KUDO Operators](0023-enable-disable-features.md) | implementable |  |
 | [0024 - Enhanced Operator Parameters](0024-parameter-enhancement.md) | implemented |  |
 | [0025 - Template toYaml function](0025-template-to-yaml-function.md) | implemented | New toYaml function for use in templates |