[MacPorts] #39647: py-redis: update to 2.7.6

[MacPorts]

#39647: py-redis: update to 2.7.6
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 Reporter:  jmr@…   |      Owner:  stromnov@…
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  py-redis
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 Released 2013-06-14: https://pypi.python.org/pypi/redis

 The livecheck also needs to be fixed as it doesn't find this version.

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Ticket URL: <https://trac.macports.org/ticket/39647>
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