[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3390: Drop upper bound for attrs

[Tahoe-LAFS]

#3390: Drop upper bound for attrs
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 Reporter:  sajith   |          Owner:  sajith
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:
Component:  unknown  |        Version:  n/a
 Keywords:           |  Launchpad Bug:
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 #3389 will add an upper bound for `attrs` library.  We will need to drop
 it when we are ready, at the end of Python 3 porting.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3390>
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