feat: make require-returns-description accept void functions (fixes #157)

[golopot]

Fixes #157 .

If the return type is {void} or {undefined}, return description is not required.

[gajus]

🎉 This PR is included in version 4.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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[eXigentCoder]

Hey there, just a quick update, it seems to still be an issue if your return type is {Promise<undefined>} or {Promise<void>}