Fix assigning properties to non-writable error object (updated) #5

When certain errors such as a response time-out occur, the addErrorData() function would attempt to assign req/res information to the error, failing to do so because errors from the errors library are read-only.

This change removes addErrorData() in favor of using the library's option-style constructor way of assigning arbitrary properties to an error.

When certain errors such as a response time-out occur, the `addErrorData()` function would attempt to assign req/res information to the error, failing to do so because errors from the `errors` library are read-only. This change removes `addErrorData()` in favor of using the library's [option-style constructor](https://github.com/bodenr/errors#defining-error-messages) way of assigning arbitrary properties to an error.

Thanks! Published in 1.2.8.

Thanks! Published in `1.2.8`.

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Fix assigning properties to non-writable error object (updated) #5

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