test failure: dnscache main test suite should error on invalid reverse lookup

[simevo]

this test fails:

it('should error on invalid reverse lookup', function(done) {
  dns.reverse('1.1.1.1', function(err) {
    assert.ok((err instanceof Error));
    done();
  });
});

with:

Uncaught AssertionError [ERR_ASSERTION]: false == true

1.1.1.1 is now a valid ip address