Resolve strict React errors in combination with Gutenberg

[moorscode]

Because React has deprecated Life-cycle methods and Gutenberg has Strict-mode enabled, we receive a lot of warnings when building for development environments.

These should be fixed.

Warning: Unsafe lifecycle methods were found within a strict-mode tree:
    in Unknown (created by e)
    in e (created by RemountOnPropChange(e))
    in RemountOnPropChange(e)
    in WithSelect(Component)

componentWillMount: Please update the following components to use componentDidMount instead: SvgIcon__StyledSvg

componentWillReceiveProps: Please update the following components to use static getDerivedStateFromProps instead: Connect(LocalizedComponent), SvgIcon__StyledSvg

componentWillUpdate: Please update the following components to use componentDidUpdate instead: Connect(LocalizedComponent)

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

[IreneStr]

Updating styled components to 4.0 should fix this.

[IreneStr]

This might be fixed in the styled components update in Yoast/yoast-components#825 and/or #12209

Make sure to have define( 'SCRIPT_DEBUG', true ); in your wp-config.php when testing.