Add version attribute where maintainers |= nckx

This will probably be mandatory soon, and is a step in the right
direction. Removes the deprecated meta.version, and move some meta
sections to the end of the file where I should have put them in
the first place.

pkgs/applications/version-management/git-and-tools/git-bz/default.nix

@@ -2,9 +2,9 @@
 , asciidoc, docbook_xml_dtd_45, docbook_xsl, libxslt, makeWrapper, xmlto
 , pythonPackages }:
 
-let version = "3.2015-09-08"; in
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   name = "git-bz-${version}";
+  version = "3.2015-09-08";
 
   src = fetchgit {
     sha256 = "19d9c81d4eeabe87079d8f60e4cfa7303f776f5a7c9874642cf2bd188851d029";
@@ -12,7 +12,6 @@ stdenv.mkDerivation {
     url = "git://git.fishsoup.net/git-bz";
   };
 
-
   nativeBuildInputs = [
     asciidoc docbook_xml_dtd_45 docbook_xsl libxslt makeWrapper xmlto
   ];
@@ -32,7 +31,6 @@ stdenv.mkDerivation {
   '';
 
   meta = with stdenv.lib; {
-    inherit version;
     description = "Bugzilla integration for git";
     longDescription = ''
       git-bz is a tool for integrating the Git command line with the