private ITaskItem TaskItemFor(Release release, ReleaseAsset asset)
 {
     var item = new TaskItem();
     // I don't think there's a way, via the API, to get something like this:
     // https://github.com/git-tfs/msbuild-tasks/releases/download/v0.0.9/GitTfsTasks-0.0.9.zip
     item.ItemSpec = "https://github.com/" + Repository + "/releases/download/" + TagName + "/" + asset.Name;
     item.MaybeSetMetadata("ContentType", asset.ContentType);
     item.MaybeSetMetadata("Id", asset.Id.ToString());
     item.MaybeSetMetadata("Label", asset.Label);
     item.MaybeSetMetadata("Name", asset.Name);
     item.MaybeSetMetadata("State", asset.State);
     return item;
 }