File handles leak

[BenoitMercier]

It looks like whenever there's a write to the log, a file handle is consumed and never recovered. After a while, file handles are exhausted.

Here's how I'm using it:

logger.add(function() {
	return new (winstonGraylog)({
		name: 'Graylog',
		level: logLevelGreylog,
		silent: false,
		handleExceptions: true,
		humanReadableUnhandledException: false,
		exceptionsLevel: 'error',
		baseMsg: {
			host: hostname,
			facility: loggerParams.facility,
			app: loggerParams.appRouting
		},
		gelfPro: {
			adapterName: 'udp',
			adapterOptions: {
				host: config.greyloghost,
				port: parseInt(config.greylogport)
			}
		}
	})
})

At the os level, "lsof -p [pid] | wc -l" will show an increasing amount of opened sockets on each writes to the log.
Same goes for "ls -l /proc/[pid]/fd | wc -l"

Using 1.0.13, there are no problems
At 1.0,14 and 1.0.15, the above code won't run. I get: error: uncaughtException: winstonGraylog is not a constructor
At 1.0.16 and 1.0.17, this is when I see the problem with file handles being consumed indefinetely,