Gulp Version Number

npm install --save gulp-package-number

Require this into your existing gulpfile and away you go. Example below:

var gulp = require('gulp');
var rename = require('gulp-rename');
var less = require('gulp-less');
var packageNumber = require('gulp-package-number');
var LessPluginCleanCSS = require('less-plugin-clean-css');
var cleancss = new LessPluginCleanCSS({ advanced: true });

var pathLess = [
	'./brands/*/theme-deployment/*.less'
];

gulp.task('less', function() {
  gulp.src(pathLess)
  	.pipe(packageNumber())
    .pipe(less({
      plugins: [cleancss]
    }))
    .pipe(rename({
      extname: '.css',
      suffix: versionNumber + '.min'
    }))
    .pipe(gulp.dest('dist/styles'));
});

gulp.task('default', ['less']);