[MacPorts] #61317: py38-cartopy needs update to version 0.18

[MacPorts]

#61317: py38-cartopy needs update to version 0.18
-------------------------+----------------------
  Reporter:  jolivetr    |      Owner:  petrrr
      Type:  update      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  py-cartopy  |
-------------------------+----------------------

Comment (by massonseb):

 I agree, version 0.18 fixes bugs. For instance, the example hereafter does
 not work with 0.17 but works with 0.18:
 http://xarray.pydata.org/en/stable/plotting.html#maps

-- 
Ticket URL: <https://trac.macports.org/ticket/61317#comment:3>
MacPorts <https://www.macports.org/>
Ports system for macOS