Update Phonegap/cordova to 1.6.x

Run the command below to update PushBots plugin:

cordova plugin update pushbots-cordova-plugin

If you face any problem, you can reinstall android platform and it's recommended to use cordova-android 6.4.0+

cordova platform remove android 
cordova platform add android
cordova plugin update pushbots-cordova-plugin

To update phonegap build project just update version to 1.6.x and make sure minSDK version for android is set to 15:

<gap:plugin name="pushbots-cordova-plugin" spec="1.6.x" source="npm" />
<preference name="android-minSdkVersion" value="15" />