[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 isezen):

 Replying to [comment:3 mf2k]:
 > Here is the problem:
 >
 > {{{
 > :info:build NetworkX 2.3+ requires Python 3.5 or later (2.7 detected).
 > }}}

 I already have python 3.6 and also 3.7 installed and python 3.6 is set as
 active for python command. Also python2 and python3 are properly set.
 (sudo port select --set python python36)

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Ticket URL: <https://trac.macports.org/ticket/58349#comment:4>
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