rxfire

4.0.0

a5768b0aa #3932 - Point browser field to esm build. Now you need to use default import instead of namespace import to import firebase.

Before this change
```
import * as firebase from 'firebase/app';
```
After this change
```
import firebase from 'firebase/app';
```
Updated dependencies [ef33328f7, a5768b0aa, 8939aeca0, 79b049375, 344bd8856, 0322c1bda, 4b540f91d, ffef32e38, 602ec18e9, b247ffa76]:
- firebase@8.0.0