Fix to export `turbolinksAdapterMixin` (#38)
Fix to export `turbolinksAdapterMixin` (#38)

Since 396fb1a1734365f0eff8dafc25e4f10c8694d95c, "Mixin Option 2: Single Component" has been broken.

```
"export 'turbolinksAdapterMixin' was not found in 'vue-turbolinks'
```

To keep v2.1.0's behavior, let back the export module name.
jeffreyguenther/vue-turbolinks