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/cataract/build.nix

@@ -31,7 +31,7 @@ stdenv.mkDerivation rec {
     homepage = http://cgg.bzatek.net/;
     description = "a simple static web photo gallery, designed to be clean and easily usable";
     license = stdenv.lib.licenses.gpl2;
-    maintainers = [ stdenv.lib.maintainers.matthiasbeyer ];
+    maintainers = with stdenv.lib.maintainers; [ ];
     platforms = with stdenv.lib.platforms; linux ++ darwin;
   };
 }