Compatibility with Meteor 2.3

package.js

@@ -1,15 +1,15 @@
 /* globals Package, Npm, Cordova */
 Package.describe({
   name: 'activitree:push',
-  version: '2.0.8',
+  version: '2.0.9',
   summary: 'Push Notifications for Cordova and Web/PWA with Firebase (FCM).',
   git: 'https://github.com/activitree/meteor-push.git'
 })
 
 Npm.depends({
   'firebase-admin': '8.13.0',
   firebase: '7.17.2',
-  events: '3.2.0'
+  events: '3.3.0'
 })
 
 Cordova.depends({
@@ -18,9 +18,7 @@ Cordova.depends({
 })
 
 Package.onUse(api => {
-  api.versionsFrom('1.8')
-  api.use(['ecmascript'])
-
+  api.versionsFrom(['1.8', '2.3'])
   api.use(['tracker'], ['web.browser', 'web.cordova'])
   api.use(['accounts-base'], ['web.browser', 'web.cordova', 'server'], { weak: true })
 
@@ -32,8 +30,6 @@ Package.onUse(api => {
     'random'
   ], ['client', 'server'])
 
-  api.use('mongo', 'server')
-
   // API's
   api.addFiles('lib/server/pushToDevice.js', 'server')
   api.addFiles('lib/server/internalMethods.js', 'server')