update maintainers

Signed-off-by: Mabel Zhang <mabel@openrobotics.org>

Author: mabelzhang

package.xml

@@ -2,7 +2,8 @@
   <name>rqt_plot</name>
   <version>0.4.12</version>
   <description>rqt_plot provides a GUI plugin visualizing numeric values in a 2D plot using different plotting backends.</description>
-  <maintainer email="dthomas@osrfoundation.org">Dirk Thomas</maintainer>
+  <maintainer email="mabel@openrobotics.org">Mabel Zhang</maintainer>
+  <maintainer email="logans@cottsay.net">Scott K Logan</maintainer>
   <maintainer email="scholz@sim.tu-darmstadt.de">Dorian Scholz</maintainer>
   <maintainer email="namniart@gmail.com">Austin Hendrix</maintainer>