Change a pronoun in the readme from `he` to `they`

Using gender neutral language in your documentation is a inclusion win!

Here's some documents describing more context here:
- https://en.wikipedia.org/wiki/Singular_they#Trend_toward_gender-neutral_language
- https://open.buffer.com/inclusive-language-tech
- https://www.grammarly.com/blog/use-the-singular-they/

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