Update dependency uglifyjs-webpack-plugin to v2.2.0

Author: renovate-bot

packages/iotex-react-block-producers/package.json

@@ -110,7 +110,7 @@
     "tslint-microsoft-contrib": "6.1.1",
     "tslint-require-connnect-typing": "1.0.1",
     "typescript": "3.4.4",
-    "uglifyjs-webpack-plugin": "2.1.2",
+    "uglifyjs-webpack-plugin": "2.2.0",
     "webpack": "4.36.1",
     "webpack-bundle-analyzer": "3.3.2",
     "webpack-cli": "3.3.3",

packages/iotex-react-footer/package.json

@@ -96,7 +96,7 @@
     "tslint-microsoft-contrib": "6.1.1",
     "tslint-require-connnect-typing": "1.0.1",
     "typescript": "3.4.5",
-    "uglifyjs-webpack-plugin": "2.1.3",
+    "uglifyjs-webpack-plugin": "2.2.0",
     "webpack": "4.36.1",
     "webpack-bundle-analyzer": "3.3.2",
     "webpack-cli": "3.3.3",

packages/iotex-react-i18n-detector/package.json

@@ -53,7 +53,7 @@
     "tslint-microsoft-contrib": "6.2.0",
     "tslint-require-connnect-typing": "1.0.1",
     "typescript": "3.5.3",
-    "uglifyjs-webpack-plugin": "2.1.3",
+    "uglifyjs-webpack-plugin": "2.2.0",
     "webpack": "4.36.1",
     "webpack-cli": "3.3.3",
     "webpack-node-externals": "1.7.2"

packages/iotex-react-language-dropdown/package.json

@@ -100,7 +100,7 @@
     "tslint-microsoft-contrib": "6.1.1",
     "tslint-require-connnect-typing": "1.0.1",
     "typescript": "3.4.4",
-    "uglifyjs-webpack-plugin": "2.1.2",
+    "uglifyjs-webpack-plugin": "2.2.0",
     "webpack": "4.36.1",
     "webpack-bundle-analyzer": "3.3.2",
     "webpack-cli": "3.3.3",