Update README.md

Simply changed GCE to GCP, which is the right acronym for Google Cloud Platform.

Author: m8nt0

README.md

@@ -16,7 +16,7 @@ We like to think of it as `kubectl` for clusters.
 `kops` will not only help you create, destroy, upgrade and maintain production-grade, highly
 available, Kubernetes cluster, but it will also provision the necessary cloud infrastructure.
 
-AWS (Amazon Web Services) and GCE (Google Cloud Platform) are currently officially supported, with DigitalOcean, Hetzner and OpenStack in beta support, and Azure in alpha.
+AWS (Amazon Web Services) and GCP (Google Cloud Platform) are currently officially supported, with DigitalOcean, Hetzner and OpenStack in beta support, and Azure in alpha.
 
 ## Can I see it in action?