chore: upgrade deps

package.json

@@ -40,8 +40,8 @@
     "memoize-one": "^5.0.0",
     "modern-normalize": "^0.5.0",
     "prop-types": "^15.5.10",
-    "react": "16.8.2",
-    "react-dom": "16.8.2",
+    "react": "16.8.3",
+    "react-dom": "16.8.3",
     "react-modal": "^3.8.1",
     "react-router-dom": "4.4.0-beta.4",
     "react-window": "^1.5.0",
@@ -67,7 +67,7 @@
     "babel-eslint": "^10.0.1",
     "babel-loader": "^8.0.5",
     "clean-webpack-plugin": "^1.0.0",
-    "copy-webpack-plugin": "^4.6.0",
+    "copy-webpack-plugin": "^5.0.0",
     "css-loader": "^2.0.1",
     "cssnano": "^4.1.7",
     "eslint": "^5.13.0",