possible fix for notify bug

package-lock.json

@@ -1,6 +1,6 @@
 {
     "name": "@root/greenlock-express",
-    "version": "3.0.15",
+    "version": "3.0.18",
     "lockfileVersion": 1,
     "requires": true,
     "dependencies": {

package.json

@@ -1,6 +1,6 @@
 {
     "name": "@root/greenlock-express",
-    "version": "3.0.17",
+    "version": "3.0.18",
     "description": "Free SSL and managed or automatic HTTPS for node.js with Express, Koa, Connect, Hapi, and all other middleware systems.",
     "main": "greenlock-express.js",
     "homepage": "https://greenlock.domains",

worker.js

@@ -7,7 +7,7 @@ var msgPrefix = "greenlock:";
 
 Worker.create = function() {
     var greenlock = {};
-    ["getAcmeHttp01ChallengeResponse", "get", "notify"].forEach(function(k) {
+    ["getAcmeHttp01ChallengeResponse", "get", "notify", "_notify"].forEach(function(k) {
         greenlock[k] = function(args) {
             return rpc(k, args);
         };