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/timewarrior/default.nix

@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
     description = "A command-line time tracker";
     homepage = https://tasktools.org/projects/timewarrior.html;
     license = licenses.mit;
-    maintainers = with maintainers; [ matthiasbeyer mrVanDalo ];
+    maintainers = with maintainers; [ mrVanDalo ];
     platforms = platforms.linux ++ platforms.darwin;
   };
 }