readme/architecture: fix readme to reflect diagram architecture update.

This corrects the statement that the arch diagram is out of date since
it was updated in kubernetes#21096.

Signed-off-by: Victor Palade <victor@cloudflavor.io>

README.md

@@ -7,7 +7,7 @@
 This repository contains tools and configuration files for the testing and
 automation needs of the Kubernetes project.
 
-Our [architecture diagram](docs/architecture.svg) provides a (wildly out of date [#13063])
+Our [architecture diagram](docs/architecture.svg) provides an (updated [#13063])
 overview of how the different tools and services interact.
 
 ## CI Job Management