Update README.md

README.md

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 This repository contains various scripts in Perl, BASH, and Python scripts to use in genome-wide association studies, single variant analyses, regional analyses, and gene-centered analyses. The genotypes are expected to be imputed using [IMPUTE2](http://mathgen.stats.ox.ac.uk/impute/impute_v2.html) and the core of the collection of scripts makes use of [SNPTEST v2.5.4+](https://mathgen.stats.ox.ac.uk/genetics_software/snptest/snptest.html)and [QCTOOL v2.0.2+](https://www.well.ox.ac.uk/~gav/qctool/#overview). 
 
 All scripts are annotated for debugging purposes - and future reference. The scripts will work within the context of a certain Linux environment (in this case a _CentOS7_ system with _Simple Linux Utility for Resource Management [SLURM]_). As such we have tested GWASToolKit on CentOS6.6, CentOS7, and macOS since El Capitan (version 10.11.[x]).