translate docs/releases-and-migration

[sottar]

translate docs/releases-and-migration

https://www.gatsbyjs.org/docs/releases-and-migration/

[Naturalclar]

PR ありがとうございます！Suggest したので確認お願いします

[sottar]

ありがとうございます！反映したので確認お願いします！

[hirotaka]

Lintで指摘されているのを、Suggestしました。

[hirotaka]

ありがとうございます！LGTM 👍

[Naturalclar]

ありがとうございます！

[gatsbot]

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

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