update docs

README.md

@@ -8,7 +8,7 @@ le-challenge-dns
 | [acme-v2.js](https://git.coolaj86.com/coolaj86/acme-v2.js)
 |
 
-A manual (interactive CLI) dns-based strategy for node-letsencrypt for setting, retrieving,
+A manual (interactive CLI) dns-based strategy for greenlock.js for setting, retrieving,
 and clearing ACME DNS-01 challenges issued by the ACME server
 
 Prints out a subdomain record for `_acme-challenge` with `keyAuthDigest`
@@ -31,14 +31,16 @@ npm install --save le-challenge-dns@2.x
 Usage
 -----
 
+The challenge can be set globally like this:
+
 ```bash
 var leChallengeDns = require('le-challenge-dns').create({
   debug: false
 });
 
-var LE = require('letsencrypt');
+var Greenlock = require('greenlock');
 
-LE.create({
+Greenlock.create({
   server: LE.stagingServerUrl                               // Change to LE.productionServerUrl in production
 , challengeType: 'dns-01'
 , challenges: {
@@ -48,6 +50,16 @@ LE.create({
 });
 ```
 
+In can also be set in the `approveDomains` callback instead, like this:
+
+```
+function approveDomains(opts, certs, cb) {
+  opts.challenges = { 'dns-01': leChallengeDns };
+  ...
+  cb(null, { options: opts, certs: certs });
+}
+```
+
 NOTE: If you request a certificate with 6 domains listed,
 it will require 6 individual challenges.
 
@@ -62,7 +74,7 @@ For ACME Challenge:
 
 Note: `get()` is a no-op for `dns-01`.
 
-For node-letsencrypt internals:
+For greenlock.js internals:
 
 * `getOptions()` returns the internal defaults merged with the user-supplied options
 * `loopback(defaults, domain, challange, done)` performs a dns lookup of the txt record