README: link to github.com/pebbe/proj

pebbe · Aug 31, 2019 · eb9c45b · eb9c45b
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-The [Go](http://golang.org/) package _proj_ provides an interface to the Cartographic Projections Library [PROJ](https://proj.org/).
+The [Go](http://golang.org/) package _proj_ provides a limited interface to the Cartographic Projections Library [PROJ](https://proj.org/).
+
+For PROJ version 5 and beyond, see also: https://github.com/pebbe/proj
 
 Keywords: cartography, cartographic projection