NPM: Upgrade libraries

New dependency is jQuery, we already depended on it it but now we use it
from npm package for easier version control and upgrades.

gulpfile.js

@@ -1,5 +1,6 @@
 var argv         = require('minimist')(process.argv.slice(2));
 var autoprefixer = require('gulp-autoprefixer');
+var cache        = require('gulp-cached');
 var chmod        = require('gulp-chmod');
 var concat       = require('gulp-concat');
 var git          = require('gulp-git');
@@ -11,8 +12,7 @@ var plumber      = require('gulp-plumber');
 var rename       = require('gulp-rename');
 var sass         = require('gulp-sass');
 var sourcemaps   = require('gulp-sourcemaps');
-var uglify       = require('gulp-uglify');
-var cache        = require('gulp-cached');
+var uglify       = require('gulp-uglify-es').default;
 
 var enabled = {
     uglify: argv.production,

package.json

@@ -8,24 +8,24 @@
 	},
 	"devDependencies": {
 		"gulp": "~3.9.1",
-		"gulp-autoprefixer": "~2.3.1",
-		"gulp-cached": "~1.1.0",
-		"gulp-chmod": "~1.3.0",
-		"gulp-concat": "~2.6.0",
-		"gulp-if": "^2.0.1",
-		"gulp-git": "~2.4.2",
-		"gulp-pug": "~3.2.0",
-		"gulp-jade": "~1.1.0",
-		"gulp-livereload": "~3.8.1",
-		"gulp-plumber": "~1.1.0",
-		"gulp-rename": "~1.2.2",
-		"gulp-sass": "~2.3.1",
-		"gulp-sourcemaps": "~1.6.0",
-		"gulp-uglify": "~1.5.3",
+		"gulp-autoprefixer": "~6.0.0",
+		"gulp-cached": "~1.1.1",
+		"gulp-chmod": "~2.0.0",
+		"gulp-concat": "~2.6.1",
+		"gulp-if": "^2.0.2",
+		"gulp-git": "~2.8.0",
+		"gulp-livereload": "~4.0.0",
+		"gulp-plumber": "~1.2.0",
+		"gulp-pug": "~4.0.1",
+		"gulp-rename": "~1.4.0",
+		"gulp-sass": "~4.0.1",
+		"gulp-sourcemaps": "~2.6.4",
+		"gulp-uglify-es": "^1.0.4",
 		"minimist": "^1.2.0"
 	},
 	"dependencies": {
 		"bootstrap": "^4.1.3",
+		"jquery": "^3.3.1",
 		"popper.js": "^1.14.4"
 	}
 }