Always sends extraArgs

[dandv]

Due to passing all arguments to rollbar, I see that all occurrences of a log item show a null extraArgs:

import winston from 'winston';
import { } from 'winston-transport-rollbar';

const log = winston.createLogger({
  transports: [
    new winston.transports.Rollbar({
      rollbarConfig: { accessToken: 'REPLACEME' },
      format: winston.format.simple(),
    }),
  ],
  levels: { critical: 0, error: 1, warn: 2, info: 3, debug: 4 },
});

// winston-transport-rollbar sends a null extraArgs
log.critical('No extra args here');  // ... but extraArgs [null] shows up in the UI