remove unneeded dependencies

Author: george

package-lock.json

@@ -97,11 +97,9 @@
     "rollup-plugin-babel": "^4.3.2",
     "rollup-plugin-node-resolve": "^5.2.0",
     "rollup-plugin-terser": "^5.1.1",
-    "rollup-plugin-uglify": "^6.0.2",
     "sass-loader": "^7.1.0",
     "style-loader": "^0.23.1",
     "terser-webpack-plugin": "^1.3.0",
-    "uglify-js": "^3.6.0",
     "webpack": "^4.35.0",
     "webpack-cli": "^3.3.0",
     "webpack-dev-server": "^3.7.2",