add in links to main story and methodology.

README

@@ -8,6 +8,13 @@ Reoffended       |    |    |
 This repository contains a Jupyter notebook and data for the ProPublica story "Machine Bias."
 
 Story:
+https://www.propublica.org/article/machine-bias-risk-assessments-in-criminal-sentencing/
+
+Methodology:
+https://www.propublica.org/article/how-we-analyzed-the-compas-recidivism-algorithm/
+
+Notebook (you'll probably want to follow along in the methodology):
+https://github.com/propublica/compas-analysis/blob/master/Compas%20Analysis.ipynb
 
 Main Dataset:
 compas.db - a sqlite3 database containing criminal history, jail and prison time, demographics and COMPAS risk scores for defendants from Broward County.