MAINTAINERS: add my name for Launchpad

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

MAINTAINERS

@@ -58,6 +58,7 @@ website                                 Robert Swain, Lou Logan
 mailinglists                            Michael Niedermayer, Baptiste Coudurier, Lou Logan
 Google+                                 Paul B Mahol, Michael Niedermayer, Alexander Strasser
 Twitter                                 Lou Logan
+Launchpad                               Timothy Gu
 
 
 libavutil