Dep: downgrade react-dev-utils to fix #85

package.json

@@ -53,7 +53,7 @@
     "material-ui-toggle-icon": "^1.1.1",
     "mdi-material-ui": "^6.9.0",
     "mini-css-extract-plugin": "0.8.0",
-    "monaco-editor-webpack-plugin": "^5.0.0",
+    "monaco-editor-webpack-plugin": "^3.0.0",
     "optimize-css-assets-webpack-plugin": "5.0.3",
     "pnp-webpack-plugin": "1.5.0",
     "postcss-flexbugs-fixes": "4.1.0",
@@ -68,7 +68,7 @@
     "react-async-script": "^1.1.1",
     "react-color": "^2.18.0",
     "react-content-loader": "^5.0.2",
-    "react-dev-utils": "^11.0.4",
+    "react-dev-utils": "9",
     "react-dnd": "^9.5.1",
     "react-dnd-html5-backend": "^9.5.1",
     "react-dom": "^16.12.0",
@@ -97,7 +97,7 @@
     "typescript": "^3.9.2",
     "url-loader": "2.1.0",
     "webpack": "4.41.0",
-    "webpack-dev-server": "3.2.1",
+    "webpack-dev-server": "3.11.3",
     "webpack-manifest-plugin": "2.1.1",
     "workbox-webpack-plugin": "4.3.1"
   },