confirmation with URL

[Fraborak]

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What is the purpose of your issue?

• Bug report (encountered problems with amazon-dash)
• Feature request (request for a new functionality)
• Question
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Description

with telegram and pushbullet, it can be usefull to have a generic confirmation like a http (post or other) to send message on a service (push, ifttt ...)

like that :
confirmations:
send-url:
url: 'http://domain.com/path/to/webhook'
method: post
content-type: json
body: '{"key": "yhythhbhbgbF1", "msg": "button pushed"}'