Module Support `import` Issue

Modern ES Modules are the standard for node environments, etc.

This does not work:
```ts
import Geotab from "mg-api-js";
```

This **does** work:
```ts
import * as Geotab from "mg-api-js";
```

Perhaps the README.md, etc., should reflect this? I'm not entirely sure what is going on with the `default` export but there seems to be a collision of sorts.