[MacPorts] #53868: py27-parsedatetime missing dependency on py27-future

[MacPorts]

#53868: py27-parsedatetime missing dependency on py27-future
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 Reporter:  danielluke  |      Owner:
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  py27-parsedatetime
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 Just noticed certbot on my box failing after upgrading my ports - looks
 like the py27-parsedatetime update to 2.3 broke this. Installing
 py27-future fixed it, so should be a simple fix.

 I'm not just committing a change because I haven't tested with other
 python versions.

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Ticket URL: <https://trac.macports.org/ticket/53868>
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