[MacPorts] #43105: py-coverage @3.6: update to @3.7.1 add py34 subport

[MacPorts]

#43105: py-coverage @3.6: update to @3.7.1 add py34 subport
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 Reporter:  Peter.Danecek@…  |      Owner:  macports-tickets@…
     Type:  update           |     Status:  new
 Priority:  Normal           |  Milestone:
Component:  ports            |    Version:
 Keywords:  haspatch         |       Port:  py-coverage py34-coverage
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 The provided patch updates the port to version 3.7.1 and enables `py34`
 support. This port has nomaintainer, so I took the liberty to simplify it
 somewhat. The portions removed are in IMO not required or better replaced
 by the provided patch.

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Ticket URL: <https://trac.macports.org/ticket/43105>
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