Update README.md

README.md

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 # Mondrian: Display the relative occurrence and co-occurrence of events in a sample <img src="man/figures/hexsticker.png" align="right" style="float:right; height:120px;"/>
 
-[![CRAN_Status_Badge](http://www.r-pkg.org/badges/version/Mondrian)](http://cran.r-project.org/package=Mondrian)
+[![CRAN_Status_Badge](https://www.r-pkg.org/badges/version/Mondrian)](http://cran.r-project.org/package=Mondrian)
 [![CRAN Downloads](https://cranlogs.r-pkg.org/badges/Mondrian)](https://cran.r-project.org/package=Mondrian)
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