gocode-gomod: add vendorSha256

Changed files
+2
pkgs
development
tools
gocode-gomod
+2
pkgs/development/tools/gocode-gomod/default.nix
···
sha256 = "YAOYrPPKgnjCErq8+iW0Le51clGBv0MJy2Nnn7UVo/s=";
};
+
vendorSha256 = null;
+
postInstall = ''
mv $out/bin/gocode $out/bin/gocode-gomod
'';