Update mailmap with new identity

Author: mwaskom

.mailmap

@@ -83,6 +83,7 @@ Michael Waskom <michael.l.waskom@gmail.com> Michael Waskom <mwaskom@mit.edu>
 Michael Waskom <michael.l.waskom@gmail.com> Michael Waskom <mwaskom@stanford.edu>
 Michael Waskom <michael.l.waskom@gmail.com> mwaskom <mwaskom@mit.edu>
 Michael Waskom <michael.l.waskom@gmail.com> mwaskom <mwaskom@stanford.edu>
+Michael Waskom <michael.l.waskom@gmail.com> mwaskom <mwaskom@nyu.edu>
 Oscar Esteban <code@oscaresteban.es> Oscar Esteban <code@oscaresteban>
 Oscar Esteban <code@oscaresteban.es> oesteban <code@oscaresteban.es>
 Russell Poldrack <poldrack@gmail.com> Russ Poldrack <poldrack@gmail.com>