"onNavigationStateChange" Unable to listen for route changes for single-page applications

I use onNavigationStateChange to monitor the change of URL:

`onNavigationStateChange = (navState) => {
console.log(navState)
}`

however, it will not be called if the page your WKWebView is trying to open is a SPA.

# Environment
```
OS: macOS Sierra 10.13.6
Node: 8.9.1
Yarn: 0.24.5
npm: 5.4.0

Packages: (wanted => installed)
react-native: 0.53.0
react: 16.3.1
react-native-wkwebview-reborn: 1.22.0
```

## Steps to Reproduce

1.WKWebView opens https://eos.live and logs in
2.Click to jump to other pages

When the web page in WKWebView uses history.pushState () to change URL, onNavigationStateChange does not execute

## Expected Behavior
onNavigationStateChange executes after each URL change

## Actual Behavior
onNavigationStateChange does not execute every time URL changes

## Reproducible Demo
```

```

Start at the onNavigationStateChange entry point and the WKWebView navigation handling. Reproduce the issue with the provided eos.live SPA example and history.pushState URL changes; done means the callback executes after each URL change.

Written by the indexing model from the issue text.