Traducao using-a-plugin-in-your-site

[adeonir]

Qual o objetivo dessa pull request?

• Adição de uma nova tradução
• Correção em uma tradução existente

Qual arquivo foi traduzido/corrigido?

https://github.com/gatsbyjs/gatsby-pt-BR/blob/master/docs/docs/using-a-plugin-in-your-site.md

Algum comentário em relação a tradução?

[iaurg]

Muito bom Adeonir, obrigado por contribuir 🎉

[gatsbot]

Holy buckets, @adeonir — we just merged your PR to Gatsby! 💪💜

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