Restore support passing the defaultNS as I18nextProvider prop

[alexbakum]

During react-i18next evolved the support (introduced at #478) of defaultNS prop has been dropped from I18nextProvider. So attempting to restore it.
We're still looking forward to share same instance of i18next between different provider instances and hooks.

const i18n = /* some i18next instantiating */
const Translated = () => {
  const {t} = useTranslation();

  return (<div>{t('the_key')}</div>);
};
const FirstWrapper = () => (
  <I18nextProvider i18n={i18n} defaultNS="firstOne">
    <Translated />
  </I18nextProvider>
);
const SecondWrapper = () => (
  <I18nextProvider i18n={i18n} defaultNS="secondOne">
    <Translated />
  </I18nextProvider>
);

[coveralls]

Coverage remained the same at 91.915% when pulling c8534e7 on alexbakum:restore-default-ns into 7d3056e on i18next:master.

[jamuhl]

thank you...was published in react-i18next@10.11.0

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