Update flask_pusher.py

[ScriptProdigy]

Only make endpoints if its the first time making them, ignore "AssertionError: View function mapping is overwriting an existing endpoint function: pusher.auth" error.

Sorry about all the updates, these are changes I've made manually for some time now but can't deploy to production like that. If you could do another release <3

[coveralls]

Coverage decreased (-1.2%) to 97.484% when pulling 1649239 on ScriptProdigy:patch-2 into ab5f06e on iurisilvio:master.

[iurisilvio]

Why are you initializing the extension two times with the same app?

Your patch fix the problem, but I'm not sure if it is a bug or if you are using Flask wrong.

def test_call_init_app_again(self):
    pusher = Pusher(self.app)
    pusher = Pusher(self.app)

It raises an AssertionError.

If this solution makes sense, a better solution is to check the app.extensions and does not initialize again if pusher is already there.

[iurisilvio]

I prefer to maintain the current behaviour. You must not start the extension more than one time.