Add changelog and release v0.3.0

Author: elafarge

CHANGELOG.md

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+CHANGELOG
+---------
+
+### 0.3.0 - RBAC !
+
+#### Added
+ * It is now possible to create `kops` clusters with RBAC enabled by default
+ * etcd volumes are encrypted
+ * support for kops ability to disable the automatic creation of security groups
+   when creating a LoadBalancer service
+
+#### Fixed
+ * During `terraform destroy`, avoid errors that occur in case the cluster has
+   already been deleted outside of Terraform
+ * Kops cluster domain and your cluster's kube-dns domain are now setup
+   accordingly
+
+### 0.2.0 - Add relevant variables and outputs to our kops modules
+
+#### Fixed
+ * premature Internet Gateway destroy triggering Terraform errors on destroyed
+   (could be worked around by running destroy twice)
+
+#### Added
+ * the ASG generated by kops with the `kops-ig` module now have their names
+   exposed as outputs (so that you can - for instance - expose your ingress
+   controllers as a NodePort on the host and wire them to an ELB)
+ * Terraform variable to attach custom security groups to an instance group
+   (for the same purpose essentially)
+ * kops-created subnets now have their subnet ids exposed as outputs (so that
+   you can use Terraform to create resources in these same subnets)
+
+### 0.1.0 - First release of Karch
+
+A Terraform module designed as a wrapper around kops, it makes it possible to
+spawn kops clusters using the `kops-cluster` and `kops-ip` modules, supports
+cluster updates and deletes and exposes resources created by kops to the rest of
+your Terraform code, as simple Terraform outputs.