Merge pull request #19 from jambonz/feat/moh_01

add onHoldHook to dial verb

specs.json

@@ -198,6 +198,7 @@
     "properties": {
       "id": "string",
       "actionHook": "object|string",
+      "onHoldHook": "object|string",
       "answerOnBridge": "boolean",
       "callerId": "string",
       "callerName": "string",

test/jambonz-verb-test.js

@@ -67,6 +67,7 @@ test("validate correct verbs", async (t) => {
     {
       "verb": "dial",
       "actionHook": "/outdial",
+      "onHoldHook": "/onHoldHook",
       "callerId": "+16173331212",
       "callerName": "Tom",
       "answerOnBridge": true,