Pass onHide callback option to the Toast components

[y1n0]

This solves issue #60.

We can pass an onHide: (id, position) => {} to be called in the end of the hiding mechanism.

const { hide } = cogoToast.success('This is a success message.', {
  onClick: () => {
    hide();
  },
  onHide: (id, position) => {
    console.log(`hid toast ${id}`);
  }
});

[ankit-indexnine]

This onHide callback doesn't seem to be working. I tried logging a few console messages inside it, but none of them were printed.