Add link to Gerrit mining slides

sat.md

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index ccb2cd2..8174460 100644
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 empirical studies of the code reviewing processes of large open source
 systems, such as Qt and OpenStack.
 
+[Slides](https://www.dropbox.com/s/rphmjkay4yf22dy/GerritSummit.pdf?dl=0)
+
 [more](http://shanemcintosh.org/tags/code-review.html)
 
 *Shane McIntosh, McGill University*