Fix typo in README.md of eslint-plugin-prefer-let

[mbalabash]

Motivation

I was reading readme.md file of eslint-plugin-prefer-let plugin and discovered a typo in the text.

Clear documentation it’s a big part of DX. That’s the reason why I introduce this change.

Approach

Fixing typo in the text by removing the duplicated word.

[changeset-bot]

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Latest commit: 2c32658

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[cowboyd]

Thanks @mbalabash!