Comply with react strict mode

[JimmyLaurent]

React strict mode complains about the use of "componentWillReceiveProps" in "I18nextProvider".

Can we can replace it with "getDerivedStateFromProps" as suggested by the warnings ?

Thanks

[jamuhl]

Sure...are you open for a PR? Else i will add the change in the next version. Guess not to urgent to get patched.

[JimmyLaurent]

Done.

I had to mirror the i18n prop in the state, though.

And you're right, it's not urgent.

[jamuhl]

Thank you...will take a look later today

[jamuhl]

should be solved with 022b9aa

published on npm in react-i18next@8.3.6

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