Environment details

• OS: Mac OS
• Node.js version: 12.14.1
• npm version: 6.13.4
• @google-cloud/error-reporting version: 2.0.0

Steps to reproduce

1. Create a reporter:

const reporter = new ErrorReporting({ reportMode: "always" });

2. Report with additionalMessage

reporter.report(new Error("Something is wrong"), undefined, { extraInfo: "this", otherInfo: "that", ...});

3. Check report google cloud "error reporting"

Nothing about additionalMessage is displayed

Inner code check

    function reportManualError(err, request, additionalMessage, callback) {
		...
        if (is.string(additionalMessage)) {
            em.setMessage(additionalMessage);
        }

Object type is never handled, however type definition is as this:

report: (err: any, request?: manualRequestExtractor.Request, additionalMessage?: string | {}, callback?: manualInterface.Callback | {} | string) => ErrorMessage;