Add support of Edge Browser for Push Communication Service

MS anounced support of push for Edge browser.

https://blog.izooto.com/microsoft-edge-push-notifications-support-release/
Right now IBM Cloud  push service support Chrome, Firefox, Safari, iOS and Android
MS ecosystem is huge of course, Chrome dominating right now, but Edge have a chance to gain part  of IE11 users in the fututre during OS modernization that the reason to add in  supported list on IBM Cloud push notification service.

At least Five competitors services already support that feature including Azure!