message: Convert objects and such to usable strings in rageshake
  Fixes
diff: @@ -71,6 +71,18 @@ class ConsoleLogger {
  log(level, ...args) {
  // We don't know what locale the user may be running so use ISO strings
  const ts = new Date().toISOString();
  +
  + // Convert objects and errors to helpful things
  + args = args.map((arg) => {
  + if (arg instanceof Error) {
  + return arg.message + (arg.stack ? `\n${arg.stack}` : '');
  + } else if (typeof(arg) === 'object') {
  + return JSON.stringify(arg);
  + } else {
  + return arg;
  + }
  + });
  +
  // Some browsers support string formatting which we're not doing here
  // so the lines are a little more ugly but easy to implement / quick to
  // run.
  