gawp: switch to fetchFromGitHub

pkgs/tools/misc/gawp/default.nix

@@ -1,18 +1,16 @@
-{ lib, buildGoPackage, fetchgit }:
-
-with builtins;
+{ lib, buildGoPackage, fetchFromGitHub }:
 
 buildGoPackage rec {
   pname = "gawp";
-  version = "20160121-${lib.strings.substring 0 7 rev}";
-  rev = "5db2d8faa220e8d6eaf8677354bd197bf621ff7f";
+  version = "unstable-2016-01-21";
 
   goPackagePath = "github.com/martingallagher/gawp";
 
-  src = fetchgit {
-    inherit rev;
-    url = "https://github.com/martingallagher/gawp";
-    sha256 = "0bbmbb1xxdgvqvg1ssn9d4j213li7bbbx3y42iz4fs10xv7x4r0c";
+  src = fetchFromGitHub {
+    owner = "martingallagher";
+    repo = "gawp";
+    rev = "5db2d8faa220e8d6eaf8677354bd197bf621ff7f";
+    sha256 = "sha256-DGTSz+4gaEd+FMSPvtY6kY4gJGnJah3exvu13sNadS0=";
   };
 
   goDeps = ./deps.nix;