CHANGELOG.md in uglifier-4.1.19 vs CHANGELOG.md in uglifier-4.1.20

@@ -1,4 +1,8 @@
+## 4.1.20 (17 November 2018)
+
+- update UglifyJS to [3.4.8](https://github.com/mishoo/UglifyJS2/compare/v3.4.9...v3.4.8)
+
 ## 4.1.19 (11 September 2018)
 
 - update UglifyJS to [3.4.9](https://github.com/mishoo/UglifyJS2/compare/v3.4.7...v3.4.9)
 
 ## 4.1.18 (09 August 2018)