Incorrect init option "vibration" in a few ios samples on PAYLOAD.md

[jcesarmobile]

https://github.com/phonegap/phonegap-plugin-push/blob/master/docs/PAYLOAD.md

There are two iOS init samples where a vibration option is used. But that option doesn't exists or is not documented:

var push = PushNotification.init({
    "ios": {
        "sound": "true",
        "vibration": "true",
        "badge": "true",
        "clearBadge": "true"
    }
});

var push = PushNotification.init({
    "ios": {
        "sound": true,
        "vibration": true,
        "badge": true,
        "categories": {
            "invite": {
                "yes": {
                    "callback": "app.accept", "title": "Accept", "foreground": true, "destructive": false
                },
                "no": {
                    "callback": "app.reject", "title": "Reject", "foreground": true, "destructive": false
                },
                "maybe": {
                    "callback": "app.maybe", "title": "Maybe", "foreground": true, "destructive": false
                }
            },
            "delete": {
                "yes": {
                    "callback": "app.doDelete", "title": "Delete", "foreground": true, "destructive": true
                },
                "no": {
                    "callback": "app.cancel", "title": "Cancel", "foreground": true, "destructive": false
                }
            }
        }
    }
});

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