Make Winston logger handle errors properly

[mountaindude]

The logging module of qs-jwt does not currently handle error logging as well as it should.
Specifically, in some cases there is no stack trace or error message when errors occur.

This can be easily fixed by adding the following to the Winston.createLogger call:

winston.format.errors({ stack: true })

[mountaindude]

Example

logTransports.push(
    new winston.transports.Console({
        name: 'console',
        level: config.get('Butler.logLevel'),
        format: winston.format.combine(
            winston.format.errors({ stack: true }),
            winston.format.timestamp(),
            winston.format.colorize(),
            winston.format.simple(),
            winston.format.printf((info) => `${info.timestamp} ${info.level}: ${info.message}`)
        ),
    })
);