nltk: Now in upstream

nltk.nix

@@ -1,20 +0,0 @@
-with import <nixpkgs> {};
-
-buildPythonPackage rec {
-  name = "nltk-${version}";
-  version = "3.2.1";
-
-  src = fetchurl {
-    url = "mirror://pypi/n/nltk/${name}.tar.gz";
-    sha256 = "0skxbhnymwlspjkzga0f7x1hg3y50fwpfghs8g8k7fh6f4nknlym";
-  };
-
-  propagatedBuildInputs = [ pythonPackages.sqlite3 ];
-
-  meta = with stdenv.lib; {
-    homepage = http://www.nltk.org/;
-    description = "Natural Language Toolkit is a platform for building Python programs to work with human language data";
-    platforms = platforms.all;
-    license = licenses.asl20;
-  };
-}