Update NLopt_R_Reference.md

Updating vintage 2010 data.

doc/docs/NLopt_R_Reference.md

@@ -2,6 +2,8 @@
 # NLopt R Reference
 ---
 
-An NLopt interface for [GNU R](https://en.wikipedia.org/wiki/GNU_R) was developed by [Jelmer Ypma](http://www.ucl.ac.uk/~uctpjyy) at [University College London](https://en.wikipedia.org/wiki/University_College_London) (UCL), and is currently available as a separate download (with documentation) from:
+An NLopt interface for [GNU R](https://en.wikipedia.org/wiki/GNU_R) was developed by [Jelmer Ypma](https://www.linkedin.com/in/jelmerypma/) when he was at [University College London](https://en.wikipedia.org/wiki/University_College_London) (UCL), and is currently available as a separate download (with documentation) from:
+
+- Stable: [https://CRAN.R-project.org/package=nloptr](https://CRAN.R-project.org/package=nloptr)
+- Development: [https://github.com/jyypma/nloptr](https://github.com/jyypma/nloptr)
 
--   [<http://www.ucl.ac.uk/~uctpjyy/nloptr.html>](http://www.ucl.ac.uk/~uctpjyy/nloptr.html)