Make init return a promise to comply with Greenlock's expectations

lib/index.js

@@ -29,7 +29,7 @@ module.exports.create = function(config) {
 
 		init: function(opts) {
 			//request = opts.request;
-			return null;
+			return Promise.resolve(null);
 		},
 
 		set: function(data) {