Updating package dependencies due to security issues.

Author: Martin Krulis

package.json

@@ -152,10 +152,10 @@
     "strip-loader": "^0.1.2",
     "style-loader": "^0.17.0",
     "terser-webpack-plugin": "^1.1.0",
-    "webpack": "^4.20.2",
-    "webpack-cli": "^3.1.1",
-    "webpack-dev-middleware": "^3.4.0",
-    "webpack-dev-server": "^3.1.9",
-    "webpack-isomorphic-tools": "^3.0.2"
+    "webpack": "^4.36.1",
+    "webpack-cli": "^3.3.6",
+    "webpack-dev-middleware": "^3.7.0",
+    "webpack-dev-server": "^3.7.2",
+    "webpack-isomorphic-tools": "^3.0.6"
   }
 }