Possibility to extend escapeIllegalChars

[jelteliekens]

Hi,

The library works great but I have an issue in combination with AWS API Gateway. It is choking on some characters { } ^ because they are not encoded.

So it would be nice to pass an option to the buildQuery function that makes it possible to extends escapeIllegalChars or pass a custom escapeIllegalChars function. I'm also wondering if it is possible to use encodeURIComponent instead of the current implementation? Is there a specific reason why it is not used?

I there an approach you prefer?

I'm happy to help you out by creating a pull request.

Kind regards