remove unused libs

gulpfile.js

@@ -7,9 +7,7 @@ const gulp = require('gulp'),
 	cleanCSS = require('gulp-clean-css'),
 	minifyJS = require('gulp-minify'),
 	rename = require('gulp-rename'),
-	replace = require('gulp-string-replace'),
 	rollup = require('gulp-rollup'),
-	rollupMultiInput = require('rollup-plugin-multi-input'),
 	rollupBabel = require('rollup-plugin-babel'),
 	rollupCleanup = require('rollup-plugin-cleanup'),
 	browserSync = require('browser-sync'),
@@ -18,7 +16,6 @@ const gulp = require('gulp'),
 	path = require('path'),
 	YAML = require('yaml'),
 	cp = require('child_process'),
-	argv = require('minimist')(process.argv.slice(2)),
 	pkg = require('./package.json'),
 	year = new Date().getFullYear();