Upgrade Mastodon.py to 1.3.0

[fabaff]

Description:

Changelog: https://github.com/halcy/Mastodon.py/blob/master/CHANGELOG.rst#v130

Example entry for configuration.yaml (if applicable):

notify:
  - platform: mastodon
    name: mastodon
    access_token: !secret mastodon_access_token
    client_id: !secret mastodon_client_id
    client_secret: !secret mastodon_client_secret

Message sent with "Call Service"

{
  "message": "The sun is {% if is_state('sun.sun', 'above_horizon') %}up{% else %}down{% endif %}! Update Mastodon.py for #HomeAssistant"
}

😄 -> Ⓜ️

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass

If the code communicates with devices, web services, or third-party tools:

• New dependencies have been added to the REQUIREMENTS variable (example).
• [x New dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.