update README

README.md

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 [![Total alerts](https://img.shields.io/lgtm/alerts/g/Andrew-AbiMansour/PyGranAnalysis.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/Andrew-AbiMansour/PyGranAnalysis/alerts/)
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 PyGranAnalysis is an open-source toolkit primarily designed for analyzing DEM simulation data. It is part of the [PyGran](http://www.pygran.org) ecosystem. 
 
 **If your find PyGran useful in your research, please consider citing the following paper:**