remove state from I18nProvider

[Drapegnik]

fix #24

1. why you create new rosetta instance on every update? - just set works fine
2. when you set instance state - it leads to 1 extra render - I use ref instead

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[lopezjurip]

Thanks for the contribution @Drapegnik, I'm going to test it during this week. In the meantime I released your PR with tag useref on npm:

npm install --save next-rosetta@useref
yarn add next-rosetta@useref

[Drapegnik]

@lopezjurip, hi! any updates?