update R version in badge

README.md

@@ -9,7 +9,7 @@ Status](https://travis-ci.org/ropensci/hydroscoper.svg?branch=master)](https://t
 Status](https://ci.appveyor.com/api/projects/status/github/ropensci/hydroscoper?branch=master&svg=true)](https://ci.appveyor.com/project/ropensci/hydroscoper)
 [![codecov](https://codecov.io/github/ropensci/hydroscoper/branch/master/graphs/badge.svg)](https://codecov.io/gh/ropensci/hydroscoper)
 [![minimal R
-version](https://img.shields.io/badge/R%3E%3D-3.4.4-6666ff.svg)](https://cran.r-project.org/)
+version](https://img.shields.io/badge/R%3E%3D-3.4-6666ff.svg)](https://cran.r-project.org/)
 [![CRAN\_Status\_Badge](http://www.r-pkg.org/badges/version/hydroscoper)](https://cran.r-project.org/package=hydroscoper)
 [![packageversion](https://img.shields.io/badge/Package%20version-1.1.1-orange.svg?style=flat-square)](https://github.com/ropensci/hydroscoper)
 [![](https://cranlogs.r-pkg.org/badges/grand-total/hydroscoper)](http://cran.rstudio.com/web/packages/hydroscoper/index.html)