Update package.json version to 3.0.0-beta.1 and generate CHANGELOG.gren.md [ci skip]

CHANGELOG.gren.md

 # Changelog
 
+## 3.0.0-beta.1 (07/10/2019)
+*No changelog for this release.*
+
+---
+
 ## 3.0.0-beta.0 (02/10/2019)
 
 #### Bug Fixes:

package.json

 {
   "name": "react-native-notifications",
-  "version": "3.0.0-beta.0",
+  "version": "3.0.0-beta.1",
   "description": "Advanced Push Notifications (Silent, interactive notifications) for iOS & Android",
   "author": "Lidan Hifi <lidan.hifi@gmail.com>",
   "license": "MIT",