update dependencies (#572)

- uglify-js@3.16.1

Author: alexlamsl

package-lock.json

@@ -1,7 +1,7 @@
 {
   "name": "grunt-contrib-uglify",
   "description": "Minify JavaScript files with UglifyJS",
-  "version": "5.2.1",
+  "version": "5.2.2",
   "author": {
     "name": "Grunt Team",
     "url": "https://gruntjs.com/"
@@ -18,7 +18,7 @@
   "dependencies": {
     "chalk": "^4.1.2",
     "maxmin": "^3.0.0",
-    "uglify-js": "^3.15.4",
+    "uglify-js": "^3.16.1",
     "uri-path": "^1.0.0"
   },
   "devDependencies": {