[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3325: Add py38 to CI

[Tahoe-LAFS]

#3325: Add py38 to CI
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     Reporter:  chadwhitacre        |      Owner:
         Type:  enhancement         |     Status:  new
     Priority:  normal              |  Milestone:  Support Python 3
    Component:  dev-infrastructure  |    Version:  n/a
   Resolution:                      |   Keywords:
Launchpad Bug:                      |
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Comment (by chadwhitacre):

 PR in https://github.com/tahoe-lafs/tahoe-lafs/pull/734.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3325#comment:2>
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