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This makes two changes to the timestamp format used in assertions.
I originally started working on this pull request because I believed my IDP (SimpleSAMLphp) did not tolerate timezones in timestamps, but it turns out that SimpleSAMLphp is actually slightly spec non-compliant itself and requires timestamps to be formatted as having a literal Z at the end.
For now I'm going to use a fork of flask-saml2 to prop up my IDP, and PR the upstream, although this lends credence to @ianlintner-wf's suggestion of making datetimes customizable
Please let me know if you suggest any other changes.