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/misc/screensavers/pipes/default.nix

@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
     homepage = https://github.com/pipeseroni/pipes.sh;
     description = "Animated pipes terminal screensaver";
     license = licenses.mit;
-    maintainers = [ maintainers.matthiasbeyer ];
+    maintainers = [ ];
     platforms = platforms.unix;
   };
 }