[MacPorts] #57762: `async` is a reserved keyword in Python 3.7

[MacPorts]

#57762: `async` is a reserved keyword in Python 3.7
----------------------------+----------------------
  Reporter:  benmaier       |      Owner:  count0
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.5.2
Resolution:                 |   Keywords:
      Port:  py-graph-tool  |
----------------------------+----------------------
Changes (by mf2k):

 * cc: count0 (removed)
 * cc: mamoll (added)
 * status:  new => assigned
 * port:  py37-graph-tool => py-graph-tool
 * owner:  (none) => count0


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Ticket URL: <https://trac.macports.org/ticket/57762#comment:1>
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