[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3668: Add Windows and macOS runners for Python 3

[Tahoe-LAFS]

#3668: Add Windows and macOS runners for Python 3
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 Reporter:  itamarst  |          Owner:
     Type:  defect    |         Status:  new
 Priority:  normal    |      Milestone:  Support Python 3
Component:  unknown   |        Version:  n/a
 Keywords:            |  Launchpad Bug:
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 Right now Python 3 tests only run on Linux. We need coverage for other
 platforms.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3668>
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