Click tab button show jumpToIndex warning

### Version
Tell us which versions you are using:

- react-native-router-flux v4.0.6
- react v16.?.?
- react-native v0.61.2

### Expected behaviour

### Actual behaviour

### Steps to reproduce
For non-obvious bugs, please fork this component, modify Example project to reproduce your issue and include link here.
1. set legacy={true}
2. swipeEnabled={true}
3. click tab button then show "Warning jumpToIndex is deprecated. please upgrade your code to use 'jumpTo' instead"
### Reproducible Demo

Please provide a minimized reproducible demonstration of the problem you're reporting.

Issues that come with minimal repro's are resolved much more quickly than issues where a maintainer has to reproduce themselves.