Update README.md

Add GDAL reference

README.md

@@ -21,7 +21,7 @@ Mosaic was created to simplify the implementation of scalable geospatial data pi
 Mosaic provides geospatial tools for
 * Data ingestion (WKT, WKB, GeoJSON)
 * Data processing
-    * Geometry and geography `ST_` operations via [JTS](https://github.com/locationtech/jts)
+    * Geometry and geography `ST_` operations via [JTS](https://github.com/locationtech/jts) and [GDAL](https://github.com/osgeo/gdal)
     * Indexing (with default [H3](https://github.com/uber/h3) or BNG)
     * Chipping of polygons and lines over an indexing grid [co-developed with Ordnance Survey and Microsoft](https://databricks.com/blog/2021/10/11/efficient-point-in-polygon-joins-via-pyspark-and-bng-geospatial-indexing.html)
 * Data visualization ([Kepler](https://github.com/keplergl/kepler.gl))