Upgrade to React V17.0.2

[Jhonatangiraldo]

Description

When trying to use the HotKeys component, we got a warning due to this library still uses old react lifecycle. Ideally, we can use react hooks with the first stable version which is v17.0.2.
The component I'm having the warning in is the HotKeys, https://github.com/ruanyl/react-keyboard/blob/ee93d3a2f344f0f84dc48415454be6ecfb6723e2/src/HotKeys.tsx

Usage

import { HotKeys } from 'react-keyboard';
...
return (
    <HotKeys keyMap={keyMap} handlers={handleKeys}>
      {children}
    </HotKeys>
  );

Screenshots

[ruanyl]

@Jhonatangiraldo Thanks for reporting, I had a look at the issue, but unfortunately, one of the key features was implemented based on the behavior of componentWillMount. I don't see an easy way to refactor it so far.

PR is welcome if you have any solutions, otherwise, I will take a look when I get the time.