updated sass-loader and webpack

package.json

@@ -155,7 +155,7 @@
     "react-jss": "^10.0.0",
     "readline-sync": "^1.4.10",
     "resolve-url-loader": "^3.1.0",
-    "sass-loader": "^7.1.0",
+    "sass-loader": "^8.0.0",
     "script-ext-html-webpack-plugin": "^2.1.4",
     "source-map-loader": "^0.2.4",
     "style-loader": "^1.0.0",
@@ -167,7 +167,7 @@
     "tslint-react": "^3.6.0",
     "typescript": "^3.2.2",
     "url-loader": "^1.1.2",
-    "webpack": "^4.28.4",
+    "webpack": "^4.41.0",
     "webpack-chunk-hash": "^0.6.0",
     "webpack-cli": "^3.3.9",
     "webpack-dev-server": "^3.8.2",