update README

README.md

 # biodivMapR: an R package for α- and β-diversity mapping using remotely-sensed images <img src="man/figures/logo.png" align="right" alt="" width="120" />
 
-**[https://jbferet.github.io/biodivMapR](https://jbferet.github.io/biodivMapR/index.html)**
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