Rust implementation for sending APNs push notifications

Usage

import py3a2

# Returns integer as request status code
# * 200 Success
# * 400 Bad request
# * 403 There was an error with the certificate or with the provider authentication token
# * 405 The request used a bad `:method` value. Only `POST` requests are supported.
# * 410 The device token is no longer active for the topic.
# * 413 The notification payload was too large.
# * 429 The server received too many requests for the same device token.
# * 500 Internal server error.
# * 503 The server is shutting down and unavailable.
py3a2.send_notification(cert_file       # Binary p12 file
                        password,       # Password for the p12 file
                        device_token,   # Device token
                        title,          # Title of the message
                        message,        # Body of message
                        is_sandbox,     # Is sandbox environment
                        topic,          # Topic
                        badge,          # Badge
                        custom_id,      # APNS-ID
                        user_id)        # Custom data - user id