Bump uglify-js from 3.9.1 to 3.9.2 (#150)

Bumps [uglify-js](https://github.com/mishoo/UglifyJS2) from 3.9.1 to 3.9.2.
- [Release notes](https://github.com/mishoo/UglifyJS2/releases)
- [Commits](mishoo/UglifyJS@v3.9.1...v3.9.2)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

package.json

@@ -42,7 +42,7 @@
     "handlebars": "4.7.6",
     "istanbul": "0.4.5",
     "mocha": "7.1.2",
-    "uglify-js": "3.9.1",
+    "uglify-js": "3.9.2",
     "webpack": "4.43.0"
   },
   "dependencies": {}