**Do you want to request a _feature_ or report a _bug_?**
...

**What is the current behavior?**
_If the current behavior is a bug, please provide necessary steps for reproduction of this issue, or better the reduced test case (without any external dependencies, if possible)._

1. ...

2. ...

**What is the expected behavior?**
...

**Environment (include versions). Did this work in previous versions?**

* Device: `...`
* OS: `...`
* React-Native (version): `x.x.x`
* React-Router (version): `x.x.x`
* React-Router-Navigation (version): `x.x.x`
