Nothing stored on save

[shirha]

When I run this code I get "User has been authenticated successfully!" but nothing is saved. What am I doing wrong. Thanks.

var GithubDB = require('github-db').default;
var options = { protocol: 'https',  owner: 'shirha',  repo: 'derelict',  path: 'derelict.json' };
var githubDB = new GithubDB(options);
githubDB.auth("...");
githubDB.connectToRepo();
var article1 = { title : 'githubDB rocks', published : 'today',     rating : '5 stars'}
var article2 = { title : 'githubDB rocks', published : 'yesterday', rating : '5 stars'}
githubDB.save([article1, article2]).then((res) => { console.log(res); });