Release v6.4.0

[AaronDDM]

Change log

• Added support for Notetaker APIs
• Added support for Notetaker via the calendar and event APIs
• Added MESSAGE_BOUNCE_DETECTED to the webhook triggers
• Fixed issue to raise an explicit exception when the response lacks a JSON body (raise an explicit exception when response does not include a JSON body #520)

License

I confirm that this contribution is made under the terms of the MIT license and that I have the authority necessary to make this contribution on behalf of its copyright owner.

[kraju3]

@AaronDDM LGTM, do we also need to add this to the changelog?
#517