Use vue-wait with vue-router and beforeRouteEnter

Hello everybody,

actually I'd like to use vue-wait with vue-router and `beforeRouteEnter`

If I'm doing something like

```
beforeRouteEnter (to, _from, next) {
const promises = [
axios.get ('/api/user/1'),
];

this.$wait.start('loading.users');

axios.all (promises)
.then (([userRes]) => {
next ((vm) => {
vm.user = userRes.data.data;
});
});
},

```

I am getting an error

```
TypeError: undefined is not an object (evaluating 'this.$wait')
beforeRouteEnter — ....js
```

So how could I solve this?