Update README.md

[bunge12]

Typo correction

Description of Change(s): updated typo: founded -> found

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To help get PR's merged faster, the following is required:

• [X] Updated the documentation
• [X] Unit/Cypress test covering all cases (not needed)

Please link to relevant Google Docs or schema.org docs for what you are adding so we can review.

Please have a read of the Contributing Guide for full details.

https://github.com/garmeeh/next-seo/blob/master/CONTRIBUTING.md