Use silent-error package

Author: LevelbossMike

index.js

@@ -2,7 +2,7 @@
 'use strict';
 
 var Promise       = require('ember-cli/lib/ext/promise');
-var SilentError   = require('ember-cli/lib/errors/silent');
+var SilentError   = require('silent-error');
 var SlackNotifier = require('./lib/slack-notifier');
 var DeployPluginBase = require('ember-cli-deploy-plugin');
 

package.json

@@ -50,7 +50,8 @@
     "ember-cli-deploy-plugin": "0.1.1",
     "moment": "^2.10.3",
     "moment-duration-format": "^1.3.0",
-    "node-slackr": "^0.1.0"
+    "node-slackr": "^0.1.0",
+    "silent-error": "^1.0.0"
   },
   "ember-addon": {
     "configPath": "tests/dummy/config"