[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3404: Drop Pyrsistent 0.16.0 constraint

[Tahoe-LAFS]

#3404: Drop Pyrsistent 0.16.0 constraint
--------------------------------+---------------------------
 Reporter:  sajith              |          Owner:
     Type:  defect              |         Status:  new
 Priority:  normal              |      Milestone:  undecided
Component:  dev-infrastructure  |        Version:  n/a
 Keywords:                      |  Launchpad Bug:
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 #3403 pins Pyrsistent at version 0.16.0.  This is a placeholder to drop
 the version constraint when we're ready.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3404>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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