add revalidate property

[bmvantunes]

This will enable ISR (Incremental Static Regeneration). Useful when the translations leave outside the GitHub repository in a service like localazy or locize #754

[bmvantunes]

Not 100% sure if I should call the property revalidate or defaultRevalidate. Any suggestions?

[aralroca]

Thanks for your contribution. Looks good for me!

[aralroca]

Not 100% sure if I should call the property revalidate or defaultRevalidate. Any suggestions?

Both are correct. revalidate for me is OK.
Maybe defaultRevalidate or revalidateFallback are more descriptive. However for me is better a short name with a great description because also defaultRevalidate can be confuse, because this default is only for pages without getServerSideProps or getInitialProps, etc.

[aralroca]

@all-contributors please add @bmvantunes for code

[allcontributors]

@aralroca

I've put up a pull request to add @bmvantunes! 🎉

[bmvantunes]

Thank you very much @aralroca

PS - We forgot to pass the "revalidate" property to the webpack loader (fixed on #759)