deleteComment method
Deletes an issue comment.
API docs: https://developer.github.com/v3/issues/comments/#delete-a-comment
Implementation
Future<bool> deleteComment(RepositorySlug slug, int id) {
return github
.request('DELETE', '/repos/${slug.fullName}/issues/comments/$id')
.then((response) => response.statusCode == StatusCodes.NO_CONTENT);
}