react-notification-system Warning with React 16.0.9

[michael-ecb]

Hi,

after React update we get a warning,
react-notification-system use "componentWillMount" method but it cause warning:
Warning: componentWillMount has been renamed, and is not recommended for use. See https://fb.me/react-async-component-lifecycle-hooks for details.

thanks

[Saibamen]

@gor181: Do you have time to fix this?