Upgrade sendgrid to 3.6.5

[fabaff]

3.6.5

• Pull Migrate nmap_tracker to use different nmap lib #300 Exclude test package

3.6.4

• Pull MQTT component #250 Improve code quality

Tested with the following configuration:

notify:
  - name: sendgrid
    platform: sendgrid
    api_key: !secret sendgrid_api
    sender: you@example.com
    recipient: me@example.com

Message sent with "Call Service":

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

[mention-bot]

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