Duo authenticator status code calling

[donvargax]

Hi, I'm trying to use this but I have my duo settings to call my phone by default instead of sending a push notification, because I don't want to install the duo application on my cellphone. The status code in that case is "calling" instead of "pushed", so I'm thinking this can be fixed by also accepting a status code of "calling".

aws-adfs/aws_adfs/_duo_authenticator.py

Line 218 in 45b9929

if json_response['response']['status_code'] != 'pushed':

I'll try to come up with a pull request.

[KyleJamesWalker]

Fixed in #83

[venth]

Delivered with the version: 0.9.1