unoconv: 0.6 -> 0.8.2

Change the source from dag.wieers.com to github, which seems to
officially host the source code of the project now.

Update unoconv from 0.6 to 0.8.2, which includes several important
changes.

Delete the patch, since it has already become part of the project.

pkgs/tools/text/unoconv/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, python3, libreoffice-unwrapped, asciidoc, makeWrapper
+{ stdenv, fetchFromGitHub, python3, libreoffice-unwrapped, asciidoc, makeWrapper
 # whether to install odt2pdf/odt2doc/... symlinks to unoconv
 , installSymlinks ? true
 }:
@@ -7,19 +7,18 @@
 # will not be able to load the pyuno module from libreoffice).
 
 stdenv.mkDerivation rec {
-  name = "unoconv-0.6";
+  pname = "unoconv";
+  version = "0.8.2";
 
-  src = fetchurl {
-    url = "http://dag.wieers.com/home-made/unoconv/${name}.tar.gz";
-    sha256 = "1m3kv942zf5rzyrbkil0nhmyq9mm3007y64bb3s7w88mhr5n23kr";
+  src = fetchFromGitHub {
+    owner = "unoconv";
+    repo = "unoconv";
+    rev = version;
+    sha256 = "0ix605lk0k3hv241jb2kf4jq5744q2wh9x0pzkmay5m126vv8kq4";
   };
 
   buildInputs = [ asciidoc makeWrapper ];
 
-  # We need to use python3 because libreoffice 4.x uses it. This patch comes
-  # from unoconv.git, so it will be a part of the next release.
-  patches = [ ./unoconv-python3.patch ];
-
   preBuild = ''
     makeFlags=prefix="$out"
   '';