`new URL("C:\path\filename.png")`
is treated as a valid URL, which it is not. `phin` subsequently tries
to fetch it, but `phin` and `centra` only supports http and https anyway.
Therefore `isValidUrl` will check also the protocol.

…364)

```
<List>
  <ListItem text="NodeGui is great" />
  <ListItem text="This item has a child">
    <View>
      <Text>Hello World</Text>
    </View>
  </ListItem>
</List>
```

Reverting back to `react@^16.x.x`. `react-reconciler` should be
updated separately so that it can safely be used with `react@17.x.x`.

When installing `react-nodegui` as a dependency. It will yield a
warning:
```
npm WARN ERESOLVE overriding peer dependency
npm WARN While resolving: react-reconciler@0.25.1
npm WARN Found: react@17.0.2
npm WARN node_modules/react
npm WARN   react@"^17.0.2" from the root project
npm WARN   1 more (@nodegui/react-nodegui)
npm WARN
npm WARN Could not resolve dependency:
npm WARN peer react@"^16.13.1" from react-reconciler@0.25.1
npm WARN node_modules/react-reconciler
npm WARN   react-reconciler@"^0.25.1" from @nodegui/react-nodegui@0.13.0
npm WARN   node_modules/@nodegui/react-nodegui
npm WARN
npm WARN Conflicting peer dependency: react@16.14.0
npm WARN node_modules/react
npm WARN   peer react@"^16.13.1" from react-reconciler@0.25.1
npm WARN   node_modules/react-reconciler
npm WARN     react-reconciler@"^0.25.1" from @nodegui/react-nodegui@0.13.0
npm WARN     node_modules/@nodegui/react-nodegui
```

* upgrade module to work with nodegui 0.57.1

* fix external docs links

* fix layout function calls in conditions

* fix layout get/set on RNView

* fix centralWidget check on RNWindow

* update README.md [skip ci]

* update .all-contributorsrc [skip ci]

Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>