chore: Replace Uglify with Terser

package.json

@@ -105,6 +105,7 @@
     "style-loader": "^0.21.0",
     "systemjs": "0.20.19",
     "systemjs-plugin-css": "^0.1.36",
+    "terser-webpack-plugin": "^1.2.3",
     "ts-jest": "^23.10.4",
     "ts-loader": "^5.1.0",
     "ts-node": "^8.0.2",
@@ -113,7 +114,6 @@
     "tslint-loader": "^3.5.3",
     "tslint-react": "^3.6.0",
     "typescript": "^3.0.3",
-    "uglifyjs-webpack-plugin": "^1.2.7",
     "webpack": "4.29.6",
     "webpack-bundle-analyzer": "^3.1.0",
     "webpack-cleanup-plugin": "^0.5.1",