Lesser known method to force reactivity on Vue components

If a property changes back and forth in the same `tick`, 
it won't trigger Vue's reactivity. 

Here's how to do it dirty without a watcher:

```
this.$set(this, 'property', false)
this.$nextTick(() => {
  this.$set(this, 'property', true)
})
```

Now don't do this ever.

nickciolpan
25 Mar 2020