Give middleware function a name

[daniellockyer]

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Hi @mariusc23! 🙂

Would it be possible to give the middleware function a name? Tools such as New Relic report it as <anonymous> unless the function has a name, which makes it a lot harder to track down traces

https://github.com/mariusc23/express-query-boolean/blob/e35c21410338ef64c3274e187745b3775daa57c5/index.js#L4