Update README for DO DNS

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

Author: alexellis

README.md

@@ -105,8 +105,7 @@ Pick between the following two providers for the DNS01 challenge:
 
 * Google Cloud DNS
 * AWS Route53
-
-> Note: we will add DigitalOcean as an option when cert-manager 0.6 becomes available in helm
+* DigitalOcean DNS via cert-manager 0.6.0
 
 Configure or comment out as required in the relevant section.
 
@@ -116,13 +115,15 @@ In order to enable TLS, edit the following configuration:
 
 * Set `tls: true`
 * Choose between `issuer_type: "prod"` or `issuer_type: "staging"`
-* Choose between DNS Service `route53` or `clouddns` and update your service data
-* Go to `# DNS Service Account secret` and choose the same service
+* Choose between DNS Service `route53`, `clouddns` or `digitalocean` and then update init.yaml
+* Go to `# DNS Service Account secret` and choose and uncomment the section you need
+
+You can start out by using the Staging issuer, then switch to the production issuer.
 
-If you need to test in Staging and then go to Production without resetting the cluster:
-* Use `issuer_type: "staging"`
+* Set `issuer_type: "staging"`
 * Run ofc-bootstrap with the instructions bellow
-* Once you want to switch to the Production issuer
+
+When you want to switch to the Production issuer do the following:
 
 Flush out the staging certificates and orders