code: func (g *GithubTracker) Fetch(githubAuthToken string) chan TrackerItemContent {
  	f := githubIssueFetcher{}
  	ts := oauth2.StaticTokenSource(
  		&oauth2.Token{AccessToken: githubAuthToken},
  	)
  	tc := oauth2.NewClient(oauth2.NoContext, ts)
  	f.client = github.NewClient(tc)
  	return g.fetch(&f)
  }
docs: // Fetch tracker items from Github