add @daviian as maintainer (#2552)

Signed-off-by: David Schneiderbauer <dschneiderbauer@gmail.com>

MAINTAINERS

@@ -16,3 +16,4 @@ Patrick G <geek1011@outlook.com> (@geek1011)
 Antoine Girard <sapk@sapk.fr> (@sapk)
 Lauris Bukšis-Haberkorns <lauris@nix.lv> (@lafriks)
 Jonas Östanbäck <jonas.ostanback@gmail.com> (@cez81)
+David Schneiderbauer <dschneiderbauer@gmail.com> (@daviian)