Upgrade pushbullet.py to 0.11.0

[fabaff]

0.11.0

• bug fixes and improvements to the code
• end-to-end encryption and proxy support has been added

notify:
  - platform: pushbullet
    name: pushbullet
    api_key: !secret pushbullet_api

Message sent with "Call Service"

{"message": "The sun is {% if is_state('sun.sun', 'above_horizon') %}up{% else %}down{% endif %}!"}

[mention-bot]

@fabaff, thanks for your PR! By analyzing the history of the files in this pull request, we identified @jabesq, @mezz64 and @balloob to be potential reviewers.