Update README.md

README.md

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 # lgpr
 
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 [![travis](https://app.travis-ci.com/jtimonen/lgpr.svg?branch=master)](https://app.travis-ci.com/github/jtimonen/lgpr)
 [![coverage](https://codecov.io/gh/jtimonen/lgpr/branch/master/graph/badge.svg)](https://app.codecov.io/gh/jtimonen/lgpr)
 [![CRAN_Status_Badge](https://www.r-pkg.org/badges/version/lgpr)](https://cran.r-project.org/package=lgpr)
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 R-package for interpretable nonparametric modeling of longitudinal data using additive Gaussian processes. Contains functionality for inferring covariate effects and assessing covariate relevances. Various models can be specified using a convenient formula syntax.
 
+**NOTE:** [lgpr2](https://github.com/jtimonen/lgpr2) has been released! It allows scaling to larger data as it uses approximate Gaussian processes. Unfortunately it doesn't have all the special modeling features included in this package.
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 ## Getting started
 See overview, tutorials, vignettes and documentation at https://jtimonen.github.io/lgpr-usage/index.html.