Update package.json version to 3.0.0-beta.0 and generate CHANGELOG.gren.md [ci skip]

CHANGELOG.gren.md

 # Changelog
 
+## 3.0.0-beta.0 (02/10/2019)
+
+#### Bug Fixes:
+
+- Remove vibrate permissions maxSdkVersion, fix example project on android [#388](https://github.com/wix/react-native-notifications/pull/388)
+
+---
+
 ## 2.1.3 (22/09/2019)
 
 #### Enhancements:

package.json

 {
   "name": "react-native-notifications",
-  "version": "2.1.3",
+  "version": "3.0.0-beta.0",
   "description": "Advanced Push Notifications (Silent, interactive notifications) for iOS & Android",
   "author": "Lidan Hifi <lidan.hifi@gmail.com>",
   "license": "MIT",