Remove alert action key.

[appleboy]

Action key is not exist in alert property.

[coveralls]

Coverage remained the same at 100.0% when pulling cfbfaac on appleboy:patch-2 into 729daff on sideshow:master.

[sideshow]

This one is required for Safari Push Notifications. ie, example payload;

{
    "aps": {
        "alert": {
            "title": "Flight A998 Now Boarding",
            "body": "Boarding has begun for Flight A998.",
            "action": "View"
        },
        "url-args": ["boarding", "A998"]
    }
} 

https://developer.apple.com/library/mac/documentation/NetworkingInternet/Conceptual/NotificationProgrammingGuideForWebsites/PushNotifications/PushNotifications.html#//apple_ref/doc/uid/TP40013225-CH3-SW12

[appleboy]

@sideshow Good catch. I am missing the page about Safari Push Notifications.

[nathany]

Just fyi, the way I went with Buford is to have a separate Browser struct just for Safari.

https://github.com/RobotsAndPencils/buford/blob/master/payload/browser.go

[appleboy]

@nathany Nice...