librem: 0.5.2 -> 0.5.3

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/librem/versions.

These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 0.5.3 with grep in /nix/store/x20d9fh0yfyzm28p3sghxq01c3f2wrmw-librem-0.5.3
- directory tree listing: https://gist.github.com/b80b5c5f4dc93169cf0cfc46f4306e73

pkgs/development/libraries/librem/default.nix

···
 {stdenv, fetchurl, zlib, openssl, libre}:
 stdenv.mkDerivation rec {
-  version = "0.5.2";
+  version = "0.5.3";
   name = "librem-${version}";
   src=fetchurl {
     url = "http://www.creytiv.com/pub/rem-${version}.tar.gz";
-    sha256 = "1sv4986yyq42irk9alwp20gc3r5y0r6kix15sl8qmljgxn0lxigv";
+    sha256 = "0l401sn8lkzz9gvnvww6839xa0ys1q7w66krln194w6l8ycsg64z";
   };
   buildInputs = [zlib openssl libre];
   makeFlags = [