build: plugin xml v bump 2.9.0

Author: indrajit-roy

plugin.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <plugin xmlns="http://apache.org/cordova/ns/plugins/1.0"
  xmlns:android="http://schemas.android.com/apk/res/android"
- id="com.scgateway.phonegap" version="2.8.0">
+ id="com.scgateway.phonegap" version="2.9.0">
  <name>Scgateway SDK</name>
  <description>Scgateway wrapper Cordova Plugin</description>
  <keywords>scgateway,gateway</keywords>