anchor.diff:      version = 2;
       owner = "spf13";
       repo = "hugo";
  -    rev = "v0.17";
  -    sha256 = "025l734hc57vhxfnsrq6amr7yx3cls2p3sibgr3vmz81chmk2zky";
  +    rev = "v0.18";
  +    sha256 = "0smgfj1lzj11h4238fwyhx87l9rp4wxz4yhkqn5bwz26ha3zs0hl";
       buildInputs = [
         ace
         afero
  
positive.code:     version = 2;
      owner = "gravitational";
      repo = "trace";
      rev = "6e153c7add15eb07e311f892779fb294373c4cfa";
      sha256 = "0y1ly0n5x9vgvcc86xbs70my13ih0ag7qcys08dildl7cc6c1dh8";
      date = "2016-09-29";
      propagatedBuildInputs = [
        clockwork
        grpc
  
negative.code: 
    go-github = buildFromGitHub {
      version = 2;
      date = "2016-12-02";
      rev = "7edde482875504b49769ad097eab7c572547ff21";
      owner = "google";
      repo = "go-github";
      sha256 = "0s5yn1n74vr1fyzapjq6qzk0q27v3sr4hyxv8nf8ychdp2fybvp4";
      buildInputs = [ oauth2 ];
      propagatedBuildInputs = [ go-querystring ];
    };
  