compareLastModifiedTime does not work about gulp-changed

[agarzola]

#78 fixes the issue when I test it locally on a project that has this issue.

[Bub-la-bub]

@sygnas++ I've also noticed this wasn't working after upgrading to gulp4.

[skunkbad]

Same issue
Ubuntu 18.04
Node 10.16.0
Gulp 4.0.2
gulp-changed 4.0.0

Easily debugged:

console.log(targetStat);
console.log({
	'source': sourceFile.stat.mtimeMs,
	'target': targetStat.mtimeMs
});