Fix my entry in the mailmap

.mailmap

@@ -154,6 +154,7 @@ Lindsey Kuper <lindsey@composition.al> <lkuper@mozilla.com>
 Luke Metz <luke.metz@students.olin.edu>
 Luqman Aden <me@luqman.ca> <laden@csclub.uwaterloo.ca>
 Luqman Aden <me@luqman.ca> <laden@mozilla.com>
+Manish Goregaokar <manishsmail@gmail.com>
 Marcell Pardavi <marcell.pardavi@gmail.com>
 Margaret Meyerhofer <mmeyerho@andrew.cmu.edu> <mmeyerho@andrew>
 Mark Rousskov <mark.simulacrum@gmail.com>