Add ST-0019 to JSON.md

Author: grynspan

Documentation/ABI/JSON.md

@@ -244,4 +244,5 @@ sufficient information to display the event in a human-readable format.
 | [ST-0009](https://github.com/swiftlang/swift-evolution/blob/main/proposals/testing/0009-attachments.md#integration-with-supporting-tools) | Added attachments. | 6.2 | `0` |
 | [ST-0013](https://github.com/swiftlang/swift-evolution/blob/main/proposals/testing/0013-issue-severity-warning.md#event-stream) | Added test issue severity. | 6.3 | `"6.3"` |
 | [ST-0016](https://github.com/swiftlang/swift-evolution/blob/main/proposals/testing/0016-test-cancellation.md#integration-with-supporting-tools) | Added test cancellation. | 6.3 | `"6.3"` |
+| [ST-0019](https://github.com/swiftlang/swift-evolution/blob/main/proposals/testing/0019-include-tags-bugs-and-timeline-in-event-stream.md#json-schema-changes) | Added `tags`, `bugs`, and `timeLimit`. | 6.4 | `"6.4"` |
 | [ST-0020](https://github.com/swiftlang/swift-evolution/blob/main/proposals/testing/0020-sourcelocation-filepath.md#detailed-design) | Added `filePath`. | 6.3 | `"6.3"` |