[MacPorts] #58349: py27-networkx: update error to version 2.3_0

[MacPorts]

#58349: py27-networkx: update error to version 2.3_0
--------------------------+----------------------
  Reporter:  isezen       |      Owner:  stromnov
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.5.4
Resolution:               |   Keywords:
      Port:  py-networkx  |
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Comment (by mf2k):

 Here is the problem:

 {{{
 :info:build NetworkX 2.3+ requires Python 3.5 or later (2.7 detected).
 }}}

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Ticket URL: <https://trac.macports.org/ticket/58349#comment:3>
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