lcms2: 2.6 -> 2.7

pkgs/development/libraries/lcms2/default.nix

···
 {stdenv, fetchurl, libtiff, libjpeg, zlib}:
 
 stdenv.mkDerivation rec {
-  name = "lcms2-2.6";
+  name = "lcms2-2.7";
 
   src = fetchurl {
     url = "mirror://sourceforge/lcms/${name}.tar.gz";
-    sha256 = "1c8lgq8gfs3nyplvbx9k8wzfj6r2bqi3f611vb1m8z3476454wji";
+    sha256 = "0lvaglcjsvnyglgj3cb3pjc22nq8fml1vlx5dmmmw66ywx526925";
   };
 
   propagatedBuildInputs = [ libtiff libjpeg zlib ];