Add numpy link

Author: seisman

doc/ecosystem.md

@@ -79,9 +79,10 @@ We're working towards removing the dependency of the [rioxarray][] package in
 [contextily]: https://contextily.readthedocs.io/
 [geopandas]: https://geopandas.org/
 [matplotlib]: https://matplotlib.org/
+[numpy]: https://numpy.org/
 [pandas]: https://pandas.pydata.org/
 [pyarrow]: https://arrow.apache.org/docs/python/
 [pyogrio]: https://pyogrio.readthedocs.io/
 [rioxarray]: https://corteva.github.io/rioxarray/
 [shapely]: https://shapely.readthedocs.io/
-[xarray]: https://xarray.pydata.org/
+[xarray]: https://xarray.pydata.org/