Added Jonathan Piacenti to the AUTHORS file.
@@ -172,3 +172,4 @@ Ivica Ceraj <ceraj@mit.edu>
Jason Zhu <fmyzjs@gmail.com>
Marceau Cnudde <marceau.cnudde@gmail.com>
Braden MacDonald <mail@bradenm.com>
Jonathan Piacenti <kelketek@gmail.com>
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