Support JTS 1.17

[jiayuasu]

If use jts2geojson together with JTS 1.17+, the following exception will occur:

java.lang.NoSuchMethodError: org.locationtech.jts.geom.Polygon.getExteriorRing()Lorg/locationtech/jts/geom/LineString;
at org.wololo.jts2geojson.GeoJSONWriter.convert(GeoJSONWriter.java:79)
at org.wololo.jts2geojson.GeoJSONWriter.write(GeoJSONWriter.java:28)

Can you please support JTS 1.17+?

[jiayuasu]

According to JTS 1.17 release notes: https://github.com/locationtech/jts/releases

This is due to an API change:

API Changes

Change Polygon getExteriorRing and getInteriorRingN accessors to return LinearRing.

• This is a binary incompatible change to the method signature. Recompilation is necessary. No source code changes are required.

[lockwobr]

Version 1.18 is out now... any updates on this? if its so simple, and i open a pr for it would get merged?

[jiayuasu]

@lockwobr Yes, I also need this package to support 1.18 :-)

[lockwobr]

just opened a pr to fix this issue.

#41