[MacPorts] #56880: Add Python 3.7 subport to py-markupsafe

[MacPorts]

#56880: Add Python 3.7 subport to py-markupsafe
----------------------------+----------------------
  Reporter:  radarhere      |      Owner:  perry
      Type:  enhancement    |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:                 |   Keywords:
      Port:  py-markupsafe  |
----------------------------+----------------------

Comment (by reneeotten):

 py37-markupsafe was added [https://github.com/macports/macports-
 ports/commit/488b2751ca920d5395cf91e5460c2fe68bc6ddc8 in this commit],
 which should have closed this ticket with its commit message.

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Ticket URL: <https://trac.macports.org/ticket/56880#comment:1>
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