Update a blog link in README

Signed-off-by: Dmitry Shurupov <[email protected]>

Author: shurup

README.md

@@ -2,7 +2,7 @@
 
 k8s-image-availability-exporter (or *k8s-iae* for short) is a Prometheus exporter that warns you proactively about images that are defined in Kubernetes objects (e.g., an `image` field in the Deployment) but are not available in the container registry (such as Docker Registry, etc.).
 
-Receiving alerts when container images related to running Kubernetes controllers are missing helps you to solve the problem before it manifests itself. For more details on the reasons behind k8s-iae and how it works, please read [this article](https://blog.flant.com/announcing-k8s-image-availability-exporter/).
+Receiving alerts when container images related to running Kubernetes controllers are missing helps you to solve the problem before it manifests itself. For more details on the reasons behind k8s-iae and how it works, please read [this article](https://medium.com/flant-com/prometheus-exporter-to-check-kubernetes-images-availability-26c306c44c08).
 
 * [Deploying / Installing](#deploying) k8s-iae in your Kubernetes cluster
   * [Prometheus integration](#prometheus-integration) to scrape metrics