mail/py-pymailq: Update to 0.8.0

[loader]

Summary

Proposed commit log message:

mail/py-pymailq: Update to 0.8.0

Reviewed_by: koobs
Approved by: koobs (ports)
Differential_revision: D12198

Test Plan

• portlint: OK (WARN: Makefile: for new port, make $FreeBSD$ tag in comment section empty, to make SVN happy.)
• testport: OK (poudriere: 1200037, armv6, '', python2.7 tested)
• unitest: No Unit Test

[koobs]

For any python package that allows/supports Python 3.x in the port, packaging tests/QA with Python 3.x are super handy.

[loader]

Thanks koobs@
Sure, I just ran the testport with Python 3.6
testport: OK (poudriere: 1200040, armv6, '', python3.6 tested)