on-change event not gets triggered after changing config dynamically

[ankurk91]

The component emits an on-change event that mimics the onChange hook from flatpickr.

If we change the config after the component has been mounted; None of the methods in config retains.

This is because of Object.assign does not handle this. Looking for a cheap and fast solution to get around this.

// changing config dynamically from your components
this.$set(this.configs.basic, 'mode', 'range');

P.S: Will try to use lodash/cloneDeep and see if this can fix Object.assign behavior .
P.S: Submit a PR flatpickr/flatpickr#1152