remove link to dead project (#125)

the old repo has not updates since two years. It looks dead.

Readme.md

@@ -16,7 +16,7 @@ It is inspired by, contains code from and is designed to stay close to
  * configurable list of **remote, or local schemas locations**, enabling validating Kubernetes
    custom resources (CRDs) and offline validation capabilities
  * uses by default a [self-updating fork](https://github.com/yannh/kubernetes-json-schema) of the schemas registry maintained
-   by the [kubernetes-json-schema](https://github.com/instrumenta/kubernetes-json-schema) project - which guarantees
+   by the kubernetes-json-schema project - which guarantees
    up-to-date **schemas for all recent versions of Kubernetes**.
 
 ### A small overview of Kubernetes manifest validation