qt55.openbr: fix source

pkgs/development/libraries/openbr/default.nix

···
-{ stdenv, fetchgit, cmake, opencv, qtbase, qtsvg }:
+{ stdenv, fetchFromGitHub, cmake, opencv, qtbase, qtsvg }:
 
 stdenv.mkDerivation rec {
 
   version = "0.5";
   name = "openbr-${version}";
 
-  src = fetchgit {
-    url = "https://github.com/biometrics/openbr.git";
+  src = fetchFromGitHub {
+    owner = "biometrics";
+    repo = "openbr";
     rev = "cc364a89a86698cd8d3052f42a3cb520c929b325";
-    sha256 = "16b3mmsf9r1yqqaw89fx0c3bgfg86dz4phry89wqy2hw05szgda3";
+    sha256 = "12y00cf5dlzp9ciiwbihf6xhlkdxpydhscv5hwp83qjdllid9rrz";
   };
 
   buildInputs = [ opencv qtbase qtsvg ];