Upgrade sendgrid to 5.0.1

[fabaff]

5.0.1

• Fix issue 366
• On install, some experienced: ValueError: ("Expected ',' or end-of-list in", 'python-http-client ==3.0.', 'at', '')

Tested with the following configuration:

notify:
  - name: sendgrid
    platform: sendgrid
    api_key: !secret sendgrid_api
    sender: !secret sendgrid_sender
    recipient: !secret sendgrid_recipient

Message sent with "Call Service"

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

Checklist:

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

• Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• New dependencies have been added to the REQUIREMENTS variable ([example][ex-requir]).
• New dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.

[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.