Splat() does not work as expected

[alesmenzelsocialbakers]

Current behavior>
Splat does not correcly add meta key with the rest of arguments when no interpolation is needed.

Expected behavior:
All other arguments are added under the meta key.

Reproduction:

const { createLogger, format, transports } = require('winston');
const { SPLAT, LEVEL } = require('triple-beam');

const logger = createLogger({
  level: 'info',
  format: format.combine(format.splat(), format.json()),
  transports: [new transports.Console()],
});

logger.error('one %s', 'two', 'three');
// {"level":"error","message":"one two","meta":"three"}

logger.error('one %s', 'two', 'three', 'forth');
// {"level":"error","message":"one two","meta":["three","forth"]}

logger.error('one', 'two', 'three');
// {"level":"error","message":"one"}

logger.error('one', 'two', 'three', 'forth');
// {"level":"error","message":"one"}

[WhiteTomX]

There is a PR already #49. Would appreciate it very much!

[indexzero]

Fixed by #49. Thanks for the contribution @WhiteTomX!