'Show that user can update a reference.'

def test_update(self):

    self.token_login()
    cassette_name = self.cassette_name('update')
    with self.recorder.use_cassette(cassette_name):
        repository = self.gh.repository('itsmemattchung', 'github3.py')
        reference = repository.ref('heads/migrate-tests/git-integration-test')
        assert (reference.update('b8bcee4db99325949c4171590b8fbcc8354d54d8') is True)
