message: Update Program.cs
  Updated Kubernetes version to last non-preview 1.15.7.
diff: @@ -91,7 +91,7 @@ class Program
  ClientId = adApp.ApplicationId,
  ClientSecret = adSpPassword.Value,
  },
  - KubernetesVersion = "1.15.4",
  + KubernetesVersion = "1.15.7",
  RoleBasedAccessControl = new KubernetesClusterRoleBasedAccessControlArgs { Enabled = true },
  NetworkProfile = new KubernetesClusterNetworkProfileArgs
  {
  