update readme

README.md

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 # mhcflurry
-([MHC I](https://en.wikipedia.org/wiki/Major_histocompatibility_complex) ligand
-prediction package with competitive accuracy and a fast and [documented](http://www.hammerlab.org/mhcflurry/)
-implementation.
+[MHC I](https://en.wikipedia.org/wiki/Major_histocompatibility_complex) ligand
+prediction package with competitive accuracy and a fast, easily installed, and 
+[documented](http://www.hammerlab.org/mhcflurry/) open source codebase.
 
 MHCflurry supports Class I peptide/MHC binding affinity prediction using
 ensembles of allele-specific models. You can fit MHCflurry models to your own data