Deprecated .utcnow calls

[fitzgeraldja]

Hi there, thanks for the helpful package! Minor request, but please could all datetime.datetime.utcnow() calls (e.g. here) be replaced with datetime.datetime.now(datetime.timezone.utc), as the .utcnow method has been deprecated and will be removed in future?

[iksteen]

Excellent suggestion! I'll do that when I get around to it.