pkgs/tools: stdenv.lib -> lib

pkgs/tools/package-management/niff/default.nix

@@ -1,4 +1,4 @@
-{ stdenv
+{ lib, stdenv
 , python3
 , fetchFromGitHub
 }:
@@ -28,7 +28,7 @@ in stdenv.mkDerivation {
   meta = {
     description = "A program that compares two Nix expressions and determines which attributes changed";
     homepage = "https://github.com/FRidh/niff";
-    license = stdenv.lib.licenses.mit;
-    maintainers = [ stdenv.lib.maintainers.fridh ];
+    license = lib.licenses.mit;
+    maintainers = [ lib.maintainers.fridh ];
   };
 }