Github Gist: https://gist.github.com/Klumper/0ad49c0613606b14f1a56551e4a7d737
Explanation
I wanted to play around with the new blueprint feature. It’s a pretty simple one and it’s inspired by 📸 Send camera snapshot notification on motion 
.
The blueprint relais on the updater integration and the newest_version and release_notes attributes.
Note: I was unable to test the Android notifications
Blueprint Code
blueprint:
name: Home Assistant update notification
description: Send a notification when there's an update availiable for Home Assistant
domain: automation
input:
updater:
name: Update sensor
description: The sensor which indicates if there's an update
selector:
entity:
domain: binary_sensor
notification_title:
name: Notification title (Optional)
description: 'Default: "Upgrade time!"'
default: "Upgrade time!"
notification_message:
name: Notification message (Optional)
description: 'Default: "Home Assistant {{ newest_version }} is available"'
default: "Home Assistant {{ newest_version }} is available"
delay:
name: Delay (Optional)
description: Wait before sending the notification
default:
selector:
number:
min: 0
max: 60
unit_of_measurement: seconds
mode: slider
notify_device:
name: Device to notify
description: Device needs to run the official Home Assistant app to receive notifications
selector:
device:
integration: mobile_app
include_release_notes:
name: Include release notes
description: Toggle if you'd like to receive the release notes within the notification, default is true
selector:
boolean:
default: true
is_ios:
name: Is it an iOS device?
description: Toggle if your selected device runs iOS, default is true
selector:
boolean:
default: true
trigger:
platform: state
entity_id: !input updater
from: "off"
to: "on"
variables:
updater: !input updater
newest_version: "{{ states[updater].attributes.newest_version }}"
release_notes: "{{ states[updater].attributes.release_notes }}"
is_ios: !input is_ios
notify_device: !input notify_device
include_release_notes: !input include_release_notes
notification_title: !input notification_title
notification_message: !input notification_message
delay: !input delay
action:
- delay: "{{ delay }}"
- device_id: !input notify_device
domain: mobile_app
type: notify
title: "{{ notification_title }}"
message: "{{ notification_message }}"
data: >
{% if include_release_notes %}
{% set android_data = { "clickAction": "%s" } | format(release_notes) %}
{% set ios_data = { "url": "%s" } | format(release_notes) %}
{{ ios_data if is_ios else android_data }}
{% endif %}