update webpack-dev-server, node-sass, and react-tabs

package.json

@@ -28,7 +28,7 @@
     "react-markdown": "^4.0.8",
     "react-portal": "^4.2.0",
     "react-redux": "^5.0.4",
-    "react-tabs": "^1.0.0",
+    "react-tabs": "3.0.0",
     "redux": "^3.6.0",
     "redux-thunk": "^2.2.0",
     "reselect": "^3.0.1",
@@ -48,14 +48,14 @@
     "html-webpack-plugin": "^3.2.0",
     "mini-css-extract-plugin": "^0.4.4",
     "mocha": "^5.2.0",
-    "node-sass": "^4.9.4",
+    "node-sass": "4.12.0",
     "redux-devtools": "^3.4.0",
     "sass-loader": "^7.1.0",
     "standard": "^12.0.1",
     "style-loader": "^0.23.1",
     "webpack": "^4.20.2",
     "webpack-cli": "^3.1.2",
-    "webpack-dev-server": "^3.1.9"
+    "webpack-dev-server": "^3.1.11"
   },
   "ava": {
     "files": [