Remove maintainership

With this patch I remove myself as a maintainer for all packages I
currently maintain.

This is due the fact that I will be basically off the grid from May 2018
until early 2019, as I will be on a trip through north america.

I will revert this patch as soon as I'm back, as I plan to continue
contributing to nixpkgs then.
But as I cannot maintain anything during that time, I'd like to get this
patch merged.

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>

pkgs/applications/misc/ctodo/default.nix

@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
     homepage = http://ctodo.apakoh.dk/;
     description = "A simple ncurses-based task list manager";
     license = stdenv.lib.licenses.mit;
-    maintainers = [ stdenv.lib.maintainers.matthiasbeyer ];
+    maintainers = with stdenv.lib.maintainers; [ ];
     platforms = stdenv.lib.platforms.linux;
   };
 }