Warnings in StrictMode

[Gvozd]

Version

react-router-dom: 4.3.1
react: 16.5.2

Test Case

https://codesandbox.io/s/m3nz3jy13j

Steps to reproduce

Wrap Application with <StrictMode>

Expected Behavior

No warnings in console.

Actual Behavior

Warning in console

Warning: Unsafe lifecycle methods were found within a strict-mode tree:
    in StrictMode (created by BasicExample)
    in BasicExample

componentWillMount: Please update the following components to use componentDidMount instead: BrowserRouter, Route, Router, Switch

componentWillReceiveProps: Please update the following components to use static getDerivedStateFromProps instead: Route, Router, Switch

Learn more about this warning here:
https://fb.me/react-strict-mode-warnings

[Gvozd]

Sorry, Dupe of #6060